Z3c.dependencychecker

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- Supporting "from zope import interface"-style imports where you really want
to be told you're missing an "zope.interface" dependency instead of just
"zope" (which is just a namespace package).

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- Sorted "unneeded requirements" reports and filtered out duplicates.

- Reporting separately on dependencies that should be moved from the regular
to the test dependencies.

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- Added tests. Initial quick test puts coverage at 86%.

- Fixed bug in test requirement detection.

- Added documentation.

- Moved source code to zope's svn repository.

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- Also reporting on unneeded imports.

- Added note on re-running buildout after a setup.py change.

- Added zcml lookup to detect even more missing imports.

- Added reporting on missing regular and test imports.

- Grabbing existing requirements from egginfo directory.

- Copied over Martijn Faassen's zope importchecker script.