More work on the new partial evaluator

The work done by the partial evaluator is now divied in two stages:
 - A static "term traversal" stage that happens only once per term and uses
   only statically known information. In particular, the values of lambda bound
   variables are unknown during this stage. Some tables are transformed to
   reduce the cost of pattern matching.
 - A dynamic "function application" stage, where function bodies can be
   evaluated repeatedly with different arguments, without the term traversal
   overhead and without recomputing statically known information.

Also the treatment of predefined functions has been reworked to take advantage
of the staging and better handle partial applications.

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