Only load versions once in folder list, unit tests from VFS rename and
copy...

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

Fix deletion of metadata, fix left files by restore of versioned files,
implement restore of metadata of deleted versioned files, implements an
upgrader to delete metadata of deleted resources, courses, groups,
forums, users and temporary uploaded files

Configuration is ok, if a user is able to log in edu-sharing.

- Select resources from edu-sharing
- Use edu-sharing rendering service to display the resources
- Synchronize usage between OpenOLAT and edu-sharing
- Exchange configuration (metadata) between OpenOLAt and edu-sharing

Add exact status search in user search, change the "special" status in
the tables...