Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge
Merge
Merge
Merge
Merge
Merge
Merge
Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Singular and Referencial integrity constraints are taken into account
when considering weak equivalence on the components.

Added tests related to WeakEquiv.