[BusyBox] [patch] The mount rewrite.

[Rob Landley]

So here's a snapshot of the mount rewrite.  Needs more testing, and there's 
stuff that's still broken (like the fact that --bind and --move mounts put 
the wrong info in /etc/mtab, but so does the normal util-linux handling.  
This may be inherent to using /etc/mtab rather than /proc/mounts, I'll have 
to think about it some more...)

I need to document lots of the corner cases I had to change stuff to handle, 
but not right now.  And I don't think I updated the usage, and there's bound 
to be other polishing stuff...

But hey: code.

Rob