The hairbrained "solution" I came up with in r13716
"worked" but it was simply unnecessary and this is
what I should have just done to begin with.
The previous "solution" actually caused some display
issues in the menus.
* from and to octave spin controls and cross-updating
* new conversion utilities in PitchName.*
* code simplification, new documentation
* stop a few compiler warnings in FreqWindow.cpp on unused params
Get rid of Pitch Up/Down radio buttons.
Change Semitones validator back to allow negative entries.
Make "From:" and "To:" for Pitch be consistent with formatting for Frequency.
Make the pitch wxChoice narrower. It's at most only 5 characters.
Remove empty comments. Cruft.
