No longer creating full trees

Evolved to a branch loading system only, none of this needed anymore
Setting treeType is no longer an option

Branch loading is now the default and only way to view a tree
Don't look to nextSibling & open/close fix

No need to set node to nextSibling again, only once is needed
If condition is now else if and calling the get-tree.php script
subsequent times and only if we're opening
This means we fix the open/close dir problem and also reload the dir
each time we open
Removing branch & branchReload, this now default

No need to work with the treeType of branch or branchReload, as
reloading branches are now the default and only tree type