eGalax touchscreen calibration

[TobyM]

Here you go http://pastebin.com/yWg5JeDu. I altered the eGalaxTouchScreen.patch from the git with my new line of code.

Now I only have to figure out a nice way to access the context menu with only single leftclick avialable. Atm I use XBMC Commander on the phone or the pad or a usb keyboard for that.