[m-rev.] for post-commit review: no use_module in .int3

[Zoltan Somogyi]

For review by anyone.

My previous diff added some both some info and some questions
to compiler/notes/interface_files.html. If anyone has an opinion
on the items covered by the new XXXs, I would love to hear it.

On a related note: would anyone object if I replaced the current
parse_tree_int with a specialized parse_tree_int3 type for storing
.int3 files? They have invariants that other interface files do not,
and it would be nice to express them in the type.

Zoltan.
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