When enabling wacom put xsetwacom in PATH.

I know that gnome/kde may have their own way to configure wacom tablets
Merge pull request #125 from MarcWeber/submit/when-enabling-wacom-add-xsetwacom-to-path

When enabling wacom put xsetwacom in PATH.
btrfs: btrfsck is now actually the same binary as "btrfs"
symlinked to save space.
filesystems: add priority option for swap devices.

Useful for setting up raid0-like load balancing for swap.
By giving multiple swap devices the same prio.
kde4: use udisks2 for kde 4.10+