Reorganized a bit evarconv.ml:

- Made a distinction between truly rigid constructions (Rigid) and
  possibly flexible constructions (match/fix/meta, now called
  PseudoRigid) that are currently assimilated to rigid by lack of
  appropriate study of their flexibility. One day, the flexibility of
  these pseudo-rigid constructions will have to considered seriously.
- Removed useless Cast/Cast cases in Rigid/Rigid block (Cast
  are removed in advance and LetIn are not considered Rigid).
- Moved LetIn into the MaybeFlexible class.
- Moved the Lambda/Lambda case upwards to factorize the rules for
  eta-expansion.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13882 85f007b7-540e-0410-9357-904b9bb8a0f7

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