eGalax touchscreen calibration

[Markamc]

Thanks I'll give it a go, having some success with uinput-mapper, i can set a float and fuzz value for the user-event which prevents the jitter and should make it easier to use in xbmc.

Looking into enabling a long-press right-click and using the calib file directly from ts-calibrate, also the ts_calibrate uses a formula which includes a component of x and y in both X and Y calculations to account for skew.