updated uhd-tetra_demod.py and cqpsk.py for GNU Radio v3.74 compatibility
Merge pull request #1 from m0mik/gr_3.7.4_compatibility

updated uhd-tetra_demod.py and cqpsk.py for GNU Radio v3.74 compatibilit...
Merge remote-tracking branch 'm0mik/master'
Mike Jameson 	updated uhd-tetra_demod.py and cqpsk.py for GNU Radio v3.74 compatibility

Conflicts:
	src/demod/python/cqpsk.py