[jhc] darcs patch: Cache scoping info, avoid unnecessary maps. (and 2 more)

[Lemmih]

Tue Feb 19 16:14:10 CET 2008  Lemmih <lemmih at gmail.com>
  * Cache scoping info, avoid unnecessary maps.

Tue Feb 19 16:15:54 CET 2008  Lemmih <lemmih at gmail.com>
  * Remove debug code.

Wed Feb 20 19:40:27 CET 2008  Lemmih <lemmih at gmail.com>
  * Add a comment describing the function of E.Subst.
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