[m-rev.] for review: break up simplify.m

[Zoltan Somogyi]

This is a cleanup of simplify.m before work on fixing bug 311.

For review by anyone. One point for the reviewer to consider: should we make format_call.m
a part of the new simplify package? It does its task as part of simplification, but
the fact that format_call has something to work on is noticed by determinism analysis.

Zoltan.
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