TODO
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 * Remove pyc files when package is removed.
 * Correct package dependency.
 * Separate timerserver module from zope-timerservice product.
 * Fix zopetestcase product(may be upstream problem). Don't install this product now.
 * Remove custom debian patch from python-reportlab to make it work with Zope
 * Use svn-buildpackage for revision control of packages, which is designed
   specially for having packages in SVN