Add "-m 0" to mkfs.ext2's arguments under "Quick Setup"

See Issue #1 on GitHub.

When that bug is fixed, the `-m 0` won't strictly be necessary anymore, but it's probably a good idea to not reserve space anyway, because it's just wasted space unless backfs is run as root!
workaround for buggy pathconf() with huge filesystems on 32-bit systems
Merge branch 'master' of github.com:wfraser/backfs
remove a bunch of PATH_MAX from fsll
Don't advise making an ext2 cache FS.

Ext2 has a directory link limit of 31998, which limits the max bucket count, and hurts perf. Ext4 is much better in this regard.
Change the feature macro on fsll_debug().

DEBUG is being used for something else. Switching to FSLL_DEBUG instead.
Merge branch 'master' of github.com:wfraser/backfs
implement readlink in backfs
Merge branch 'master' into rw

Conflicts:
	Makefile
define _GNU_SOURCE for asprintf
improve argument parsing
more arg parse fixes/changes