More dynamic argument scopes

 When arguments scopes are set manually, nothing new, they stay
 as they are (until maybe another Arguments invocation).
 But when argument scopes are computed out of the argument type and
 the Bind Scope information, this kind of scope is now dynamic:
 a later Bind Scope will be able to impact the scopes of an earlier
 constant. For Instance:

 Definition f (n:nat) := n.
 About f. (* Argument scope is [nat_scope] *)
 Bind Scope other_scope with nat.
 About f. (* Argument scope is [other_scope] *)

 This allows to get rid of hacks for modifying scopes during functor
 applications. Moreover, the subst_arguments_scope is now
 environment-insensitive (needed for forthcoming changes in declaremods).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16626 85f007b7-540e-0410-9357-904b9bb8a0f7

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