grc: always show the label of the selected port

Suggested by Seth Hitefield
Fix handling of GR_USE_SYSTEM_LIBGSM and GR_USE_SYSTEM_LIBCODEC2
blocks: remove stray ctrlport XML definitions
Merge remote-tracking branch 'maitland/gr-vocoder-use-system-codecs' into maint
vocoder: minor cleanup in library detection
Merge branch 'maint'
cmake: fix FindUHD.cmake to work better wit CMake 2.6, and in general.
trellis: fix cmake variables for compatibility
Merge remote-tracking branch 'gnuradio-wg-grc/master_grcwg'
Merge branch 'master' into next
cmake: fix setting and usage of CMAKE_MODULES_DIR
cmake: whitespace only
cmake: on APPLE only, add defaults for rpath and install name info for libraries
Merge remote-tracking branch 'michaelld/refix_findUHD'
Merge remote-tracking branch 'michaelld/cmake_fixes'
Merge branch 'master' into next
digital: fixes a bug in the mpsk SNR estimators where they were reporting 3 dB too high.
Merge branch 'maint'
digital: adding output message ports for MPSK SNR probe block. Can be used to feed back SNR information to other blocks.
Merge branch 'master' into next