qtgui: increased max tabs from 5 to 20 in tab widget
Merge branch 'maint'
cmake: increased revision to 3.7.5.1 for maintenance release
Merge branch 'maint'
blocks: adding a tanh lut for control_loop blocks to use.
digital: adding use of tanh and snr info to costas loop.
qtgui: fixes issue with 1-off because of added history of 2.
Merge branch 'maint'
Merge branch 'costas_snr'