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New version (run_module_3.diff)

Takes more account of the file description reported by
PyImport. Explictly restricts itself to PY_SOURCE and
PY_COMPILED scripts.

Behaves correctly when a non-package is encountered while
parsing a dotted name (closes the file descriptor and
reports an error).

I also realised that the '-m' option doesn't currently
comprehend "__path__" variables in packages. So maybe we
*should* be loading the packages as we find them, and then
querying them for their __path__ variable.