Make life for owners of Synaptics Touchpads more pleasant :-)

 o Implement a shiny new algorithm to keep track of finger movement at
   slow speeds.  This dramatically reduces the level of questionable
   language from users trying to resize windows.

 o Properly catch the many extra buttons and dials which manufacturers
   are known to screw onto Synaptics touchpad controllers.  Currently,
   up to seven buttons are known to work, more should work too.

 o Add a number of sysctls allowing one to tune the driver to taste in
   a simple way:

     # Should the extra buttons act as axes or as middle button
     hw.psm.synaptics.directional_scrolls

     # These control the 'stickiness' at low speeds
     hw.psm.synaptics.low_speed_threshold
     hw.psm.synaptics.min_movement
     hw.psm.synaptics.squelch_level

PR:		kern/75725
Submitted by:	Jason Kuri <jay@oneway.com>
MFC after:	1 month

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