Added deadband for pitch wheel
Add dead band for panel zero centered pots
Consolidate deadband calculations to one function
Add guard at top and bottom of range when deadbanding

* This is important to get true intervals for the pitch wheel, because
  the analog voltage from the wheel as seen by the ADC is not the
  whole available range, leading to the resulting output from the ADC
  not to cover the whole 0..65535 range.
Use struct for deadband configurations
Added newline at end of ui.c
Precalculate band calibration scale factors

* Also clean up UI call to update bender when calibration changed
Cleanup
Decrease bend deadband and guardband slightly

* Initially set values seemed unnecessarily large
Merge pull request #44 from polluxsynth/release

Release
inlining deadband calculations
display deadband ajusted pot values -- cleanups
display proper adjusted bender amount
dac: small speedup, lower code size
ui: fix parameter initial value display
cleanups
ui: basic patch is now FROM TAPE + 0 -- fixes issue #41
FROM TAPE + 7 is an invalid combination due to how the membrane keypad works
sh: tentative fix for yet another tuning issue
cf Mickey B comments on my blog
midi: queue MIDI out bytes instead of sending them right away
major optimisation, as we don't need to wait for the 68b50 anymore
midi: sustain by footswitch now transmitted on MIDI out