Calibration must be performed based on the device w/h ranges and the
screen size, so in which coordinates the monitor is virtually mapped
matters little on device coordinates. This fixes calibration of devices
attached to a monitor elsewhere than (0,0) in the screen.
https://bugzilla.gnome.org/show_bug.cgi?id=719574
Copies over files from a trimmed version of xinput-calibrator and
modifies the Makefile.am to build the program as a seperate utility.
This is just to verify the functionality of the code when built with
gnome-control-center.
https://bugzilla.gnome.org/show_bug.cgi?id=657423