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Return 1 if there is an apptree named TREENAME. Return 0 else.
Create a new apptree named TREENAME. It is appended at the end of the notebook.
Return 0 if there is already an apptree called TREENAME. Return 1 else.
Destroy the apptree named TREENAME.
Return 0 if TREENAME do not exist on the apptree. Return 1 else.
Modify the 'active' flag for TREENAME.
Note that must be at least one active tree.