[m-rev.] for post-commit review: organize array.m, bt_array.m and pprint.m

[Zoltan Somogyi]

The diff mostly just moves code around, so it is not worth reviewing.
The parts worth looking at are

- the groups into which the exported predicates been moved, and
- the comments on those exported predicates.

This diff also raises a question: should we make the informal
"submodule" for random-access lists in bt_array.m an actual
documented module of the standard library, and if so, under
what name? I vote yes, but am agnostic about the name.
random_access_list would be more descriptive, but ra_list
is shorter.

Zoltan.
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