[horde] VFS "file" backend, relative paths and gollem's "change directory"

[Liam Hoekenga]

> I've committed the part that supports ~/<path>, as long as a 'home' param is
> defined. The ~<user> bit I left out, since getting the homedir from the
> posix functions isn't going to work for most cases of this driver; 
> we'll need some way of specifying where the homedirs are (or, perhaps,
> to use the posix functions, but only if configured that way).

Does that mean you got any of it working?  Cuz like I said, I couldn't make it
work at all with the current version of VFS/file.php

Liam