Now consider remaining conversion problems in solve_remaining_evars. A step going towards a more uniform evar resolution protocol, currently: - solve simple constraints (+ actually some heuristics: f.o. unif and   evar_define's heuristics) but postpone some of the remaining ones [evar_conv] - try type-classes resolution [resolve_typeclasses] - apply heuristics on remaining constraints and expect these   constraints to be resolved [consider_remaining_unif_problems] - use the implicit tactic for yet open (unconstrained) evars
Now consider remaining conversion problems in solve_remaining_evars.
A step going towards a more uniform evar resolution protocol, currently:
- solve simple constraints (+ actually some heuristics: f.o. unif and
  evar_define's heuristics) but postpone some of the remaining ones [evar_conv]
- try type-classes resolution [resolve_typeclasses]
- apply heuristics on remaining constraints and expect these
  constraints to be resolved [consider_remaining_unif_problems]
- use the implicit tactic for yet open (unconstrained) evars

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14581 85f007b7-540e-0410-9357-904b9bb8a0f7

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