tigefa4u projects Trac

Component incompletely constructed should be unregistered.

Change Wiki navigation links from:

{{{
Start Page | Index by Title | Index by Date | Last Change
}}}

to:

{{{
Start Page | Index | History | Last Change
}}}

This enables direct access to both the revision log of a page and the diff corresponding to the last modification, see #5491.

A `trac-admin ... wiki upgrade` is needed, as the RecentChanges and TitleIndex pages now need to link to each other. The ''Index'' navigation link goes to the latter.

Improved the messages generated by a `trac-admin ... wiki upgrade` command.

Be more robust in handling junk in svn filenames.

MilestoneEdit: Merge 5675 from trunk

Testing: Add more testing of the source browser. Also do a number of code
cleanups based on pylint feedback.

Testing: Bugfix; camelcase doesn't work very well if you have hypens and stuff
in it. So only return words that are alpha.

Testing: Add a check for wiki attachments

Testing: Add a test for the clone functionality. In particular check that the
summary is correct.

Testing: merge 5675 from trunk