Encryption readme update and minor rpc.cpp fixes

Edited locale/pl/LC_MESSAGES/bitcoin.po via GitHub

Upgrade dependancies and tweak build process.

Updated czech translation [only .po]

* Upgrade to use miniupnpc 1.6
* Upgrade to wxWidgets 2.9.2
* Upgrade to Bost 1.47 for Win32 Builds

Spotted by Venkatesh Srinivas <me@endeavour.zapto.org>

Unify copyright notices.

Use 'unsigned char' rather than 'char' for pchMessageStart.

Qualify make_tuple with boost:: namespace.

Regarding https://bitcointalk.org/index.php?topic=28022.0



main.cpp has: "char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };"
Per discussion on the thread linked, leaving the signedness of
pchMessageStart is unsafe for values > 0x80. This patch specifies
'unsigned char' in main.cpp and net.h.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

db.cpp has a number of uses of make_tuple and has 'using namespace
std' and 'using namespace boost'. Without qualifying make_tuple,
std::make_tuple is preferred, which is incorrect. This patch qualifies
make_tuple.
Signed-off-by: Jeff Garzik <jgarzik@exmulti.com>

Signed-off-by: Jeff Garzik <jgarzik@exmulti.com>

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

This is needed for the script unit tests.

There were some problems with the existing testing setup:

 - Makefile rules for test-file compilation used CFLAGS instead of
   CXXFLAGS in makefile.unix

Check for duplicate txins in CheckTransaction.

avoid strAddress + validity checks