Add information about required version of the userspace library/utilities
to Documentation/Changes.  Also add pointer to this and to FUSE
documentation from Kconfig.

Thanks to Anton Altaparmakov for the reminder.
Signed-off-by: NMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>