Bugfix: configure: Allow user-provided CXXFLAGS to override default optimisation, debug, and warning flags
Bugfix: Undefine _FORTIFY_SOURCE before redefining it, to avoid warnings on compilers that define it by default
Cleanup LevelDB library dependencies
Add a new checkpoint at block 279,000

From a cursory glance, it looks like block 279,000 meets the criteria for
a checkpoint block, and it's also what the bootstrap.dat torrent is at. This closes #3530.
Update linearize.py defaults to block 279,000
configure: Internal changes to make building bitcoind and bitcoin-cli optional
Bugfix: Correct captitalisation of Qt
configure: Change --with[out]-qt to --with[out]-gui and add --with[out]-cli and --with[out]-daemon to support more build configurations
configure: Minor grammatical changes to be more clear
Bugfix: Use BOOST_CPPFLAGS when testing for boost sleep vs sleep_for
Merge pull request #3551

6873cfb Update linearize.py defaults to block 279,000 (Micha)
e7906d1 Add a new checkpoint at block 279,000 (Micha)
Update OS X Homebrew docs to include new build dependencies
Adds additional zero checks for setCompact
 These encoded values should all decode to zero

   Positive Numbers
    0x01003456 (1 byte  0x00)
    0x02000056 (2 bytes 0x0000)
    0x03000000 (3 bytes 0x000000)
    0x04000000 (4 bytes 0x000000_00)

   Negative Numbers
    0x00923456 -(0 bytes, so zero)
    0x01803456 -(1 byte  0x00)
    0x02800056 -(2 bytes 0x0000)
    0x03800000 -(3 bytes 0x000000)
    0x04800000 -(4 bytes 0x000000_00)
wallet: add interface for storing generic data on destinations
[Qt] Permanently store requested payments in wallet
[Qt] Add sorting feature to the requested payments table
Don't store or send side-chain blocks lower than last checkpoint.
Merge pull request #3557

5d897f3 Update OS X Homebrew docs to include new build dependencies (Michael Ford)
Merge pull request #3242

2041365 Bugfix: Use BOOST_CPPFLAGS when testing for boost sleep vs sleep_for (Luke Dashjr)
e18e100 configure: Minor grammatical changes to be more clear (Luke Dashjr)
a9dbcf0 configure: Change --with[out]-qt to --with[out]-gui and add --with[out]-cli and --with[out]-daemon to support more build configurations (Luke Dashjr)
f472990 Bugfix: Correct captitalisation of Qt (Luke Dashjr)
f930341 configure: Internal changes to make building bitcoind and bitcoin-cli optional (Luke Dashjr)
4a290b5 Cleanup LevelDB library dependencies (Luke Dashjr)
9b4e03b Bugfix: Undefine _FORTIFY_SOURCE before redefining it, to avoid warnings on compilers that define it by default (Luke Dashjr)
123e4f8 Bugfix: configure: Allow user-provided CXXFLAGS to override default optimisation, debug, and warning flags (Luke Dashjr)
Merge pull request #3548

7b50bb2 [Qt] add utilitydialog.cpp/h and helpmessage class (Philip Kaufmann)