Refactor upgrade functions including use of v11 upgrade functions

[plecharpent]

For the moment there are 2 groups of functions allowing to upgrade xml files and whole javastics workpaces.

• The idea is to integrate unique interface functions with switches according to the target version.
  Done: upgrades functions for specific versions 9 to 10 and 10 to 11 have been set to internal and interface functions for each kind of file upgrade have been added detecting which is the initial version and upgrading to a +1 major version.

Also done for a workspace upgrade.

• If possible, chaining functions versions < 10, to 10 and 10 to 11 ? Or delay this feature later.