Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
added level variable as a member of Signature.
=>solves the issue related to the metaAttribute (attribute of the Root)
: the metaAttribute is recognized as instance of Root and is also of
level 0.

We made modifications to AddInstance method : 
 -It iterates over the inheritings and delegate the actual instantiation
 if isMetaOf() condition is satisfied. The actual solution was given by
Nicolas Feybess.
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git