umount completion

[Mikael Magnusson <mikachu@xxxxxxxxx>]

The patch I committed for umount recently seems to have a bit of a
flaw; the case I corrected was when you're inside a directory with
spaces, and want to unmount a subdirectory, that now works correctly.
But, tab completing a directory that has spaces now doesn't insert any
quoting for the inserted text. I'll try to have a look at it later.

-- 
Mikael Magnusson