header (C) fixes
Installer/linux: we were creating USB device nodes we did not want to due to an incorrect check
*.kmk,++: Mode fixes to maximize hardlinking potential during staging.
Installer/linux: adjustments to the USB device node creation script and fix a warning due to the missing class parameter when removing devices
OSE header fix
deb/rpm: adapted USB udev rules according to r68230; icons and mime (rpm needs some more work)
Main/linux/USB and Installer/linux: switch to using our own device tree under /dev