Datamodel version is now 2.1.0

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3432 a333f486-631f-4898-b8df-5754b55c2be0
More meta information about the interfaces.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3433 a333f486-631f-4898-b8df-5754b55c2be0