Check-manifest

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* Restore warning about files included in the sdist but not added to the
version control system (`issue 27
<https://github.com/mgedmin/check-manifest/issues/27>`__).

* Fix ``check-manifest relative/pathname`` (`issue 28
<https://github.com/mgedmin/check-manifest/issues/28>`__).

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* More correct MANIFEST.in parsing for exclusion rules.
* Some effort was expended towards Windows compatibility.
* Handles non-ASCII filenames, as long as they're valid in your locale
(`issue 23 <https://github.com/mgedmin/check-manifest/issues/23>`__,
`25 <https://github.com/mgedmin/check-manifest/issues/23>`__).

-----------------

* Friendlier error message when an external command cannot be found
(`issue 21 <https://github.com/mgedmin/check-manifest/issues/21>`__).
* Add suggestion pattern for `.coveragerc`.
* Python 2.6 support
(`issue 22 <https://github.com/mgedmin/check-manifest/issues/22>`__).

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* Read the existing MANIFEST.in file for files to ignore
(`issue 19 <https://github.com/mgedmin/check-manifest/issues/19>`__).

-----------------

* Fix Subversion status parsing in the presence of svn usernames longer than 12
characters (`issue 18 <https://github.com/mgedmin/check-manifest/issues/18>`__).

-----------------

* Normalize the paths of all files, avoiding some duplicate misses of
directories. (`issue 16 <https://github.com/mgedmin/check-manifest/issues/16>`__).
[maurits]