Add FUSEFS option. Assorted fixes.

This adds a FUSEFS option based on earlier work by Fedor Uporov (fsu@)
and Pedro Giffuni (pfg@).

While here, repair DOCS/NLS options, broken since r418578 (1.43.1).

Leverage OPTIONS_SUB to replace NLS and FUSEFS in pkg-plist.

Add --enable-libuuid to avoid picking up a dynamic system libuuid.so
from /usr/local which would break the static /sbin/e2fsck (by
including a lib below /usr).

Bump PORTREVISION.

Reported by: pfg@