Add a mode to reduce driver joystick sensitivity

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It's been suggested that the driver may achieve better control on low-speed 
operations by having a low-sensitivity mode on the drive joysticks.  This mode 
would essentially scale down the values sent from the joysticks to the 
tankDrive() function, thus providing finer control over drive speed.

The driver could enable this mode by holding down a button on one of the drive 
joysticks.  Beadle thinks button 2 would be the best choice.  Probably if 
button 2 on either joystick is held, low-speed mode is enabled.

Original issue reported on code.google.com by jtec...@gmail.com on 29 Mar 2013 at 4:01

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Original comment by jarr...@corr.org on 30 Mar 2013 at 11:40

• Changed state: Fixed

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Original comment by jarr...@corr.org on 30 Mar 2013 at 11:43

• Changed state: Verified