Dials back the default fuzz and threshold settings for most devices using
this driver, based on values from user feedback from forums and bug reports.
This increases smoothness and movement granularity. No changes were made for
the older devices that use the driver, as I did not find any user feedback
for them regarding these settings; however, the two settings can also now
both be specified as module parameters in case there is a desire to change
the values for devices that do not have new defaults.

There are also a couple of style cleanups per checkpatch.pl.