- Fix uncaught exception NotASort from reductionops, moving decomp_sort to retyping.ml
- In unification's w_merge, assign the evars in the same order they were found. Might
create rare incompatibilities.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16632 85f007b7-540e-0410-9357-904b9bb8a0f7