Declaremods: major refactoring, stop duplicating libobjects in modules

 When refering to a module / module type, or when doing an include,
 we do not duplicate and substitution original libobjects immediatly.
 Instead, we store the module path, plus a substitution. The libobjects
 are retrieved later from this module path and substituted, typically
 during a Require. This allows to vastly decrease vo size (up to 50%
 on some files in the stdlib). More work is done during load (some
 substitutions), but the extra time overhead appears to be negligible.

 Beware: all subst_function operations should now be
 environment-insensitive, since they may be arbitrarily delayed.
 Apparently only subst_arguments_scope had to be adapted.

 A few more remarks:

 - Increased code factorisation between modules and modtypes
 - Many errors and anomaly are now assert
 - One hack : brutal access of inner parts of module types
   (cf handle_missing_substobjs)

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16630 85f007b7-540e-0410-9357-904b9bb8a0f7

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