Fixes in rewrite and a Elimination/Case to Scheme:

- disallow dynamic generation of [case] constructs through [find_scheme]
during a rewrite, as it changes the global environment and subsequent
manipulations of the tactic may use an outdated environment.
- use local exception names so as not to catch and hide unexpected
[Not_found] exceptions.
- fix lifting of constraints for dependent function types
- Allow rewriting on morphisms (terms in function position) even with
[rewrite] (fixes bug #2178).


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12848 85f007b7-540e-0410-9357-904b9bb8a0f7

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