Use -Wall and other options set by configure automatically.
Add calibration. xinput_calibrator works Almost Perfect(TM),
but not quite. Anyway, it's a start.

The XINPUT properties follow those found in the "evdev" driver,
so xinput_calibrator picks them up automatically for
"--output-type xinput".

The driver's configuration options were also changed (again) so
they follow the xinput_calibrator output for
"--output-type xorg.conf.d".
Version 0.2.0