eGalax touchscreen calibration

[Markamc]

you can try, although you might have to tweak the calib_x_d values, if it is using overscan when using RCA, i found it helpful having the pointer values displayed on screen so you can see the offset of the pointer to the touch onscreen. you only need to change addon.xml in chosen skin (default is skin.confluence) debugging to "true".

The raw x-y data from egalax, is like yours it gives 0-2047 points over the x-y coordinates of the screen also, so it will be worth calculating the scale factors again too, don't think they are far off though.