[issue11751] Increase distutils.filelist / packaging.manifest test coverage

[Justin Love]

Justin Love <python at JustinLove.name> added the comment:

Incorporated some formatting suggestions.

Removed _actions.  Just as well, as I accidentally left in the 'blarg' bogus action ;^)

Added a test for implicit-include.

Whether 'this cannot happen' can happen depends on the output of _parse_template_line.  If you wanted to remove the catch-all and still have test backup, you'd probably have to restort to some form of fuzz-testing _process_template_line.  As the code stands now it could be removed.  I left it alone as insurance against future changes.

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Added file: http://bugs.python.org/file23244/packaging-manifest_v3.diff

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<http://bugs.python.org/issue11751>
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