Mailinglogger

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- Ignores are processed on the interpolated error message.

- Check for empty error messages is done on the interpolated error
message which in all cases is a string.

Thanks to Christian Zagrodnick for these changes.

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- Fix bug that occurred when subject format used %(asctime)s

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- Tweak installation documentation

- Add specific test runners for ZConfig, Zope 2 and Zope 3
support

- %(levelname)s in the subject of a SummarisingLogger summary
is now the highest level message handled by that logger

- Add support for specifying additional headers to the mails
sent

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- Removed hard dependency on ZConfig

- Moved to zc.buildout-based development model

- Fix some doctests for newer versions of zope.testing

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- Fixed egg distribution.

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- Added support for log entry filtering.

Thanks to Jens Vagelpohl for the work which was funded by Campux GmbH.