The calibration gui code moved the targets to x,y, instead of
placing the centre of the target at x,y, leading to a 47 pixel
(half the target's size) offset in both directions (thus 67 pixels
deviation as Pythagorus would tell us).
The name of the file was also changed to calibratorgui.c/h to avoid
it being inconsistent, this way it is no longer dependent on the
the technology.
https://bugzilla.gnome.org/show_bug.cgi?id=667797