Move the functions of OlatRootFile and OlatRootFolder to the Local
implementations to simplify the use of VFS, implements factory methods
in VFSManager, reduce the number of call to meta informations in folder
listing

OO-3055: remove library flag in taxonomy, move the info page to the document pool module, tabbed the overview of taxonomy level...

OO-3055: add new e-Assessment node in Administration, add a new document pool module, refactor the administration of taxonomy to separate the document pool features from the taxonomy itself, add an administration panl for the question pool

OO-3055, OO-3047: implementation of taxonomy module with new site, full text search, webdav access, REST API...

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branch : bps