[m-rev.] for review: make analysis.m a package

[Zoltan Somogyi]

Since this diff just moves code around, the only things
worth reviewing are

- the names of the two new modules, analysis.framework.m
  and analysis.operations.m, and

- the split of the code between them. (Together, they contain
  everything that used to be in the old analysis.m.)

For review by anyone.

Zoltan.
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