blocks: moved fxpt generators to gr-blocks.

Added C++ QA test setup.
blocks: moving vco/nco bases to gr-blocks.
Merge branch 'master' into next
blocks: removed all nco/vco and fxpt stuff from core; now in gr-blocks.

Moved the nco/vco tests to gr-blocks/test and enabled them.
ctrlport: adding ability to set/get sample rate of USRP source/sink over controlport.
blocks: moved tagged_file_sink and wavfile source/sink/base to gr-blocks.
Merge branch 'master' into next
blocks: removing tagged file sink, wavfile source/sink/base from core; now in gr-blocks.
blocks: moving control_loop into gr-blocks.
Merge branch 'master' into next
blocks: removing gri_control_loop; using gr::blocks::control_loop now.
blocks: moved file sink and base and descriptor source/sink to gr-blocks.
Merge branch 'master' into next
blocks: removing file_sink/source file_descriptor_sink/source form core and moved all refs to gr-blocks.
modtool: Python general blocks used grextras syntax
Converted gr_logger to use log4cpp
modtool: fixed general python block template
MSVC fixes

* blocks: changed peak_detector_XX from GR_CORE_API to BLOCKS_API
* blocks: fxpt_nco does not export symbols
* Added /bigobj flag to MSVC compiiles to allow for larger object files
Fixed where Windows builds look for GrVersion.cmake
blocks: udp_sink and udp_source implemented in gr-blocks using boost::asio instead of sockets.

Needs testing on non-Linux OSes.