Refined second_order_matching so that a constraint on which

occurrences to abstract can be given. This allows to force "destruct"
to necessarily abstract over all occurrences of its main argument
(only the sub-arguments that occur in the inductive type of the main
argument have their occurrences constrained by typing). This
incidentally avoids "rewrite" succeeding in rewriting only a part of
the occurrences it has to rewrite. This repairs the failure of
RecursiveDefinition which failed after pattern unification fix from
r14642).

Full support for selecting occurrence of main argument still to be
done though.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14648 85f007b7-540e-0410-9357-904b9bb8a0f7

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