Fix camlp5-ism "Ploc.Exc" and add a unification fix: when solving an

evar, do unification between the evar type and the type of the instance
to properly propagate information.
Typical example: in context ?A : Type, ?R : relation ?A. When we instantiate ?R
using a goal like x = y by @eq t, we need to instantiate A to t as well.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11357 85f007b7-540e-0410-9357-904b9bb8a0f7

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