Temporarily copied m2e 1.3 areEqual(Archetype, Archetype) method 

we need to ensure archetype with different versions are properly
handled, i.e. detected as different.

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-13339 : instanciate a Stacks in all circumstances

Signed-off-by: Fred Bricon <fbricon@gmail.com>