xserver-common patching ideas:
- set DPI in separate variable instead of being part of ARGS
+ some devices needs only DPI setting
+ default ARGS are usually fine for devices
- use /etc/default/xserver for setting ARGS/DPI for new devices
+ no need to patch Xserver anymore
+ easy to tweak on device itself
- xmodmap stuff should be machine dependent so only one xmodmap is
present on device
- zaurusd, devmand should provide session scripts instead of being
called from Ts_calibrate script
