exfat support in Quirky

Some of the guys on the Puppy Forum have been discussing exfat support in Puppy:
http://murga-linux.com/puppy/viewtopic.php?t=109803

And mavrothal has submitted patches to woof-CE:
https://github.com/puppylinux-woof-CE/woof-CE/commit/18bfb65c789d4f679fe744ead345c2c5d540cc8b

Ok, exfat support is missing from Quirky, so I have also added it to the Quirky build system. Added 'exfat-utils' and 'exfat-fuse' DEB packages to the package list.
And modified these files:

/usr/local/pup_event/frontend_funcs, frontend_change, frontend_startup,
/usr/local/bin/drive_all
/usr/sbin/pmount

Note that /sbin/probepart did not need changing. The applets guess_fstype and blkid are part of busybox, and already support exat.

Tags: quirky, linux