Included code for MacOS X port opening.
Merge branch 'HEAD' of https://github.com/dzach/nrfmon.git into work
Numerus changes. Removed the 'l','u','z' commands; their functionality is now covered by the 's' command.
Simplified the 'r' command.
Added an 'o' command to read the Tx-Rx offset.
Numerus changes. Adapted code to the new 's' command.
Added a new color creating routine, with exponential function.
Added colored background to the port combobox, indicating mode of operation.
Added transmit simulation.
Added color setting widgets.
Added a 'hold max' spectrum line.
Fixed the vertical dB indication for the 'cursor' option.
(Some) Preferences are now saved on exit and read on program start.
<Control-Key-1> now returns scan back to full width.