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- allows to directly select an address from the addressbook, chose "send
  coins" from the context menu, which sends you to sendcoins tab and fills
  in the selected address

- try to enforce the same style to all Qt related files
- remove unneeded includes from the files
- add missing Q_OBJECT, QT_BEGIN_NAMESPACE / QT_END_NAMESPACE
- prepares for a pull-req to include Qt5 compatibility

This is less confusing to most people, and doesn't rely on estimates
of the total number of blocks received from other nodes.

- use it for displaying URI parsing warnings
- use it for displaying error and information in backup wallet function
  (the information display is new and the error was a warning before)

- cleanup BitcoinGUI::incomingTransaction()
-- use message() + the information icon from message
-- comment out an unused parameter in the function definition and
   declaration
-- move all pre-checks at the beginning of the function

- as we (can) supply the CClientUIInterface::MODAL flag via the style
  parameter, we don't need a separate bool for checking the modality

- this allows to setup the trayicon before we have and want a trayicon menu
- should be of great use, when we remove that splash screen
- fixes a small bug with the toggleHideAction icon, which is not only used with
  trayicon but also with the Mac dock

- fix ThreadSafeMessageBox always displays error icon
- allow to specify MSG_ERROR / MSG_WARNING or MSG_INFORMATION without a
  custom caption / title
- allow to specify CClientUIInterface::ICON_ERROR / ICON_WARNING and
  ICON_INFORMATION (which is default) as message box icon
- remove CClientUIInterface::OK from ThreadSafeMessageBox-calls, as
  the OK button will be set as default, if none is specified
- prepend "Bitcoin - " to used captions
- rename BitcoinGUI::error() -> BitcoinGUI::message() and add function
  documentation
- change all style parameters and enum flags to unsigned
- update code to use that new API

- update Client- and WalletModel to use new BitcoinGUI::message() and
  rename the classes error() method into message()
- include the possibility to supply the wanted icon for messages from
  Client- and WalletModel via "style" parameter

Flushes the blktree/ and coins/ databases, and reindexes the
block chain files, as if their contents was loaded via -loadblock.

Based on earlier work by Jeff Garzik.

- add setStatusTip() in addition to setTooltip() where it makes sense
- add only setStatusTip() if GUI element is only used in main- or tray menu

- add an event filter on our BitcoinGUI object to prevent garbelled text
  on the status bar, which happens when we use it for e.g. displaying
  block-sync state and then a QEvent::StatusTip wants to write own text to it

- remove a double translation of "Bitcoin client"

- remove some unneeded stuff in sendcoinsentry.ui
- harmonize some "Error:"-messages

Implements #1948

- Add macro `CLIENT_VERSION_IS_RELEASE` to clientversion.h
- When running a prerelease (the above macro is `false`):
  - In UI, show an orange warning bar at the top. This will be used for other
    warnings (and alerts) as well, instead of the status bar.
  - For `bitcoind`, show the warning in the "errors" field in `getinfo`
    response.

- replace Q_WS_MAC (not supported anymore in Qt5) with Q_OS_MAC (supported
  in Qt4/5)

- re-order Qt Actions and connect() calls to match the real GUI layout,
  which makes things easier to read and understand
- remove signMessageAction and verifyMessageAction from tabGroup as we
  didn't use them anyway (as tooltips are not displayed in the menu remove
  these too)
- update 2 comments

- removes the FIRST_CLASS_MESSAGING support from the client, which was no
  default setting anyway

- be clear we don't "Show/Hide Bitcoins", but just the client window
- remove the tooltip for toggleHideAction as this is not shown anyway
- update a comment to be more general

Windows & WindowsXP style have a problem with displaying the block progress.
Add a custom stylesheet as workaround, but only when one of those renderers is active,
otherwise leave the theme alone (issue #1071).

Use the built-in icon that is also used in the dialog box itself.

- re-work code parts that check if we have a Statusbar warning
- use same variable names in the header

- this helps user to not think our Client is called "Bitcoin Wallet"
- change "About Bitcoin-Qt" to "About Bitcoin"
- change "Bitcoin debug window" to "Bitcoin - Debug window"
- change "Client" in debug Window to "Bitcoin Core"

- add a comment

- add signals signMessage() and verifyMessage() in addressbookpage.cpp
- connect to them in bitcoingui.cpp to switch to the corresponding tab in the Sign/Verify Message dialog
- make gotoSignMessageTab() and gotoVerifyMessageTab() private slots

- remove unused #include <QDebug> and lblBTC label
- update Bitcoin input field to a BitcoinAmountField to allow Bitcoin unit selection
- use BitcoinUnits::format for the resulting amount parameter in the generated URI (always use BTC as per BIP21)
- move MAX_URI_LENGTH and EXPORT_IMAGE_SIZE to guiconstants.h
- add OptionsModel in AddressBookPage and use it in on_showQRCode_clicked() to pass it to QRCodeDialog
- add OptionsModel in QRCodeDialog to enable display unit updates
- add updateDisplayUnit() slot to be able to imediately update currently set bitcoin unit
- make all labels in the UI-file plain text
- resize dialog to match for an updated layout (fields are now stacked and new field)
- remove unused parameters from private slots
- only enable save button, when QR Code was generated
- show message when entered amound is invalid
- add read-only QPlainTextEdit field to output generated URI

- add UI-feedback via QValidatedLineEdit
- copy button for generated signature was moved to the signature output field
- add an addressbook button to verify message tab
- input fields are now evenly ordered for sign and verify tabs
- update FIRST_CLASS_MESSAGING support to ensure a good UX
- add a button and context menu entry in addressbook for verify message (to be consistent with sign message)
- focus is now only set/changed, when clearing input fields or adding an address via addressbook
- re-work / update some strings
- ensure model gets initialized in the SignVerifyMessageDialog constructor
- add checks for a valid model to both addressbook buttons
- remove unneeded includes for Qt GUI elements that are listed in ui_signverifymessagedialog.h anyway

The current order of menu options in the tray menu doesn't really match expected usage patterns, this commit changes it to more logical order.

- Toggle show/hide first (unchanged)
- Then, send/receive coins actions, which are the critical functionality of bitcoin
- Then, sign/verify message
- Then finally the options, and closing with the debug window

merge toggleHidden() code into showNormalIfMinimized() to extend the functionality, but keep a simpler toggleHidden() for use in SLOT() macro

change verifymessagepage behaviour to match RPC-call "verifymessage" (input address, signature and message) / display messages in status label (remove message boxes) / resize window to make signature fully readable / change signature font to BC-address font (like in messagepage) / remove checkAddress() and place code directly in on_verifyMessage_clicked() / add visual feedback to LineEdits / remove AddressTableModel references, as they are now unused / add addr.GetKeyID(keyID) check

Dock icon on macosx already has show/hide functionality. This results in erratic behavior.

Gets rid of `MainFrameRepaint` in favor of specific update functions that tell the UI exactly what changed.

This improves the efficiency of various handlers. Also fixes problems with mined transactions not showing up until restart.

The following notifications were added:

- `NotifyBlocksChanged`: Block chain changed
- `NotifyKeyStoreStatusChanged`: Wallet status (encrypted, locked) changed.
- `NotifyAddressBookChanged`: Address book entry changed.
- `NotifyTransactionChanged`: Wallet transaction added, removed or updated.
- `NotifyNumConnectionsChanged`: Number of connections changed.
- `NotifyAlertChanged`: New, updated or cancelled alert. As this finally makes it possible for the UI to know when a new alert arrived, it can be shown as OS notification.

These notifications could also be useful for RPC clients. However, currently, they are ignored in bitcoind (in noui.cpp).

Also brings back polling with timer for numBlocks in ClientModel. This value updates so frequently during ...

change strings to Bitcoin (uppercase), where it is used as a noun and update strings to use "Qt" (and not qt or QT) / update initialisation of notificator to use qApp->applicationName() instead of a static string

add 2 labels to the overviewpage that display Wallet and Transaction status (obsolete or current) / cleanup overviewpage XML ui-file