Hide branch DIV, set fmReady to true once

The branch DIV is now a temp DIV only and not seen. Previously it was
seen onload of ICEcoder as the display of the root. However, there were
inconsistencies in line returns etc and so now even the root has a
branch built for it on load. ie, the init load and branch generating use
the same system.
Set fmReady to true if not when finished animating the folder. This only
happens on load of course and means we run init afterwards
Set $GET location to generate branch

We're now using branch generating for the root on init, so we use the
same single system.
We also get the animated effect on init of the root as a result.
autoOpenFiles if fmReady

New fmReady var, set to true when the file manager is ready
An interval is set up and auto opens files as soon as this var changes
Simplifying for loop