blocks: benchmark scripts using wrong includes.
Removing use of 'and', 'or', and 'not' for &&, ||, and !.
fec: removed ber_tools; unnecessary and not exported. Replaced compber with call to VOLK's popcount.

Added QA for ber_bf block and provided documentation for it.
fec: qa: fix use of Bool type to be actual boolean Python values
cmake: gr-dtv: fix internal GR component dependencies
cmake: OSS is not for APPLE or WINDOWS.
cmake: Use APPLE, not matching Darwin
cmake: modtool: allow the use of a MODULES_DIR to specify where cmake modules are installed.
cmake: modtool: On Apple only, set install name and use rpath correctly.
cmake: modtool: make sure our local CMake Modules path comes first.
cmake: modtool: update copyright date.
Merge remote-tracking branch 'gnuradio-wg-grc/maint_grcwg' into maint
qtgui: fixed an issue with the number sink mistreating non-float inputs.

Dealing with ints will require an api change.
qtgui: increased max tabs from 5 to 20 in tab widget
cmake: increased revision to 3.7.5.1 for maintenance release
qtgui: fixes issue with 1-off because of added history of 2.
qtgui: fixes issue of setting min/max when using qwt < 6.1.0.
grc: fix xterm setting check