Have Tree User ID available as a paramater on applicable functions

[elderamevans]

Some of the requests require you to have the Tree User ID in order to work. Right now,they're hard-coded to the logged in user's User ID (UID).

The reason for doing this is for server environments.

Rather than doing:

fs[userfoo].get(fs[userfoo].bar(baz))

It would allow servers to do:

fs[userfoo].get(fs[server].bar(baz, uid=blah))

It would still allow desktop apps (or otherwise in a single-user environment) to:

fs.get(fs.bar(baz))