Add an output curvet that applies to the servo screen to match mechanical setups.

Which board (stock / gruvin9x / sky9x / Taranis) are you using?
Taranis
What is your openTx FW version?
2647
What is your openTx EEPROM version?
dk
What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?

Please provide any additional information below.
This is just a feature request. In multiple servo setups, like flaperons, 
sometimes you have two or three mixers applied to to two channels. But often 
the servos aren't mechanically identical so to correct the difference you have 
to apply a correction to all the mixers multiple times. Would be much nicer if 
the mixers were essentially assuming a perfect mechanical setup and the servo 
setup could have a curve instead of endpoints to fix the mechanical differences 
in one place.

Thanks

Original issue reported on code.google.com by mickeyno...@tmwfl.com on 25 Jul 2013 at 9:23

Merged into: #71

DeBesten / opentx

Add an output curvet that applies to the servo screen to match mechanical setups. #72