digital: moved simple_correlator (inverse of simple_framer) to gr-digital.
blocks: adding count_bits code to gr-blocks.
Merge branch 'master' into next

Conflicts:
	gr-digital/include/CMakeLists.txt
	gr-digital/lib/CMakeLists.txt
	gr-digital/swig/CMakeLists.txt
	gr-digital/swig/digital_swig.i
digital: cleaning up conversion to 3.7 for simple_correlator.

blocks: same for count_bits.
digital: adding simple_correlator to gr-digital's block tree.
Merge branch 'master' into next

Conflicts:
	gr-digital/grc/digital_block_tree.xml
qtgui: fixed bounds checking and a typo.