Many fixes in unification:

- Restore failure when types don't unify in [unify_types] (undoing
r12075) but try to be more clever about cumulativity using the meta's
[instance_status] information.
- Fix second-order abstraction when K is not allowed to ensure that
we don't unify twice with the same subterm in
[w_unify_to_subterm_list]. A more elaborate solution would be give the
list to [w_unify_to_subterm] so that it keeps going when it finds an
already-found instantiation.
- Two "obvious" errors fixed: taking the wrong instance status when
unifying with a meta on the right and forgoting type equations in
[w_merge].


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12136 85f007b7-540e-0410-9357-904b9bb8a0f7

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