disable waterfall on windows
move gradient widget to left side
thermal gradient
release 2.2.0
start pyrf-2.3.0-dev
added scpi dialog if ';' is pressed
fixed waterfall being called if it does not exist
fixed trigger frequency lines using int instead of float
pseudo-merge from pyrf/master
Merge remote-tracking branch 'pyrf/master' into waterfall

Conflicts:
	examples/waterfall_crosshair_demo.py
	pyrf/gui/waterfall_widget.py
added waterfall.set_lookup_levels and connected to rtsa-gui plot controls
tidied the last commit
fixed trigger settings not changing if no data is received
quick hack to fix the frequency axis when decimating in SH mode
added decimation Super-het options in the thinkrf properties
changed controls layout
changed names of amplitude controls to reflect more familliar SpecA controls
made labels larger, and in a bold font
grid lines are much brighter now
began implementing averagE