More improvements of BigN, BigZ, BigQ:

 - ring/field: detection of constants for ring/field,
   detection of power, potential use of euclidean division.
 - for BigN and BigZ, x^n now takes a N as 2nd arg instead of a positive
 - mention that we can use (r)omega thanks to (ugly) BigN.zify, BigZ.zify.
   By the way, BigN.zify could still be improved (no insertion of positivity
   hyps yet, unlike the original zify).
 - debug of BigQ.qify (autorewrite was looping on spec_0).
 - for BigQ, start of a generic functor of properties QProperties.
 - BigQ now implements OrderedType, TotalOrder, and contains facts
   about min and max.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12681 85f007b7-540e-0410-9357-904b9bb8a0f7

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