Updated coq to version 8.4pl6. Changes from previous version include (apart

from bugfixes):

- Coq compilation made possible with forthcoming ocaml 4.03.
- command for locating exists notation in refman changed.
- Various improvements of the Reference Manual (especially its html version)
- implicit arguments of local definitions fixed (possible
  source of incompatibilities).
- New command "Print Debug GC".
- Function cannot define graph.
- Optimizing compilation of pattern matching.
- Better inference of impossible cases in pattern-matching.
- Evar leak in pattern-matching compilation
- ill-typed replacement in "change ... with ...".
- unbound evars in "change ... with ...".
- wrong return clause of a match pattern in Ltac.
- cleared local hints for autounfold.
- cleared local hints for autounfold.
- lost evars in "change ... with ...".
- supporting let-ins in constructors for vm_compute
- unfortunate typo in compare_height.
- unfortunate typos in absorption lemmas over bool.
- Full support of utf8 Greek letters (block U0370) in coqdoc

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