Don't show splash screen when -min is specified on the command line.

As testnet has neither DNS seeds or built-in seed addresses to
bootstrap from.

Enable accessible widgets Qt module on win32, so that people with screen readers such as NVDA can make sense of it.

Look for flushwallet/listen/irc/dnsseed/upnp instead of noflushwallet/etc. And switch default for irc to 0.

-bip16 option (default: 1) to support / not support BIP 16. And bumped default BIP16 switchover date from Feb 15 to Mar 1

This introduces CNetAddr and CService, respectively wrapping an
(IPv6) IP address and an IP+port combination. This functionality used
to be part of CAddress, which also contains network flags and
connection attempt information. These extra fields are however not
always necessary.

These classes, along with logic for creating connections and doing
name lookups, are moved to netbase.{h,cpp}, which does not depend on
headers.h.

Furthermore, CNetAddr is mostly IPv6-ready, though IPv6
functionality is not yet enabled for the application itself.

This reverts commit 21d9f367.

Replaced all occurrences of #if* __WXMSW__ with WIN32,
and all occurrences of __WXMAC_OSX__ with MAC_OSX, and made
sure those are defined appropriately in the makefile and bitcoin-qt.pro.

Makefiles now build bitcoind only.
qmake/make in top-level directory is used to build Bitcoin QT
Deleted almost all #ifdef GUI from the code (left one possibly controversial one)
Deleted xpm/ files.

To a variation on:
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2011 The Bitcoin developers

Make CKeyStore's interface work on uint160's instead of pubkeys, so
no separate global mapPubKeys is necessary anymore.