Rework on rich forms of rewrite

 1) changed the semantics of rewrite H,H' : the earlier semantics 
    (rewrite H,H' == rewrite H; rewrite H') was poorly suited for 
    situations where first rewrite H generates side-conditions. 
    New semantics is tclTHENFIRST instead of tclTHEN, that is
    side-conditions are left untouched. 

    Note to myself: check if side-effect-come-first bug of 
    setoid rewrite is still alive, and do something if yes

 2) new syntax for rewriting something many times. This syntax is 
    shamelessly taken from ssreflect: 

    rewrite ?H  means "H as many times as possible" 
      (i.e. almost repeat rewrite H, except that 
       possible side-conditions are left apart as in 1)
    rewrite !H  means "at least once" (i.e. rewrite H; repeat rewrite H)
    rewrite 3?H means "up to 3 times", maybe less 
      (i.e. something like: do 3 (try rewrite H)).
    rewrite 3!H means "exactly 3 times" (i.e. almost do 3 rewrite H).

    For instance:  rewrite 3?foo, <-2!bar in H1,H2|-*

 3) By the way, for a try, I've enabled the syntax +/- as synonyms for 
    ->/<- in the orientation of rewrite. 
   
   Comments welcome ...




git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10612 85f007b7-540e-0410-9357-904b9bb8a0f7

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