Some dead code removal + cleanups

  This commit concerns about the first half of the useless code
  mentionned by Oug for coqtop (without plugins). For the moment,
  Oug is used in a mode where any elements mentionned in a .mli
  is considered to be precious. This already allows to detect and
  remove about 600 lines, and more is still to come.

  Among the interesting points, the type Entries.specification_entry
  and its constructors SPExxx were never used. Large parts of cases.ml
  (and hence subtac_cases.ml) were also useless.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12069 85f007b7-540e-0410-9357-904b9bb8a0f7

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