Fixing a regression in unification introduced in r16205 (error raised
by solve_candidates was not anymore handled at the expected time).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16524 85f007b7-540e-0410-9357-904b9bb8a0f7
"change ... in ..." and "simpl ... in ..." now consider nested
occurrences (possible source of incompatibilities since this alters
the numbering of occurrences).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16525 85f007b7-540e-0410-9357-904b9bb8a0f7
Delayed the computation of parameters in sort polymorphism of
inductive types. This saves some computation, but also allows
incidentally to retype terms with evars without failing if an
inductive type as an argument whose type is an evar.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16526 85f007b7-540e-0410-9357-904b9bb8a0f7
Mini documentation (evar_absorb_arguments).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16527 85f007b7-540e-0410-9357-904b9bb8a0f7