Modularization of BinPos + fixes in Stdlib

 BinPos now contain a sub-module Pos, in which are placed functions
 like add (ex-Pplus), mul (ex-Pmult), ... and properties like
 add_comm, add_assoc, ...

 In addition to the name changes, the organisation is changed quite
 a lot, to try to take advantage more of the orders < and <= instead
 of speaking only of the comparison function.

 The main source of incompatibilities in scripts concerns this compare:
 Pos.compare is now a binary operation, expressed in terms of the
 ex-Pcompare which is ternary (expecting an initial comparision as 3rd arg),
 this ternary version being called now Pos.compare_cont. As for everything
 else, compatibility notations (only parsing) are provided. But notations
 "_ ?= _" on positive will have to be edited, since they now point to
 Pos.compare.

 We also make the sub-module Pos to be directly an OrderedType,
 and include results about min and max.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14098 85f007b7-540e-0410-9357-904b9bb8a0f7

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