Some small fixes
Adding Iteration XML test file.
New command to create a new iteration based on an existing one.

This will be useful when going from one iteration to the next.
Test case for the iteration xml handling.
IterationXML now parses the rejection criteria.
Automatic type conversions for the resursive dict.
Finishing test for iteration xml reading.
Removing old workaround.

The automatic type conversion superseeds this. Also some PEP8.
Added test for iteration xml writing.
Partial iteration xml writing.

Apart from the event structure it works so far.
Use ordered dictionaries for reading the iteration xml files.
Finished write support for Iteration XML files.
Added test comments to event and station tags.
Reading test for station and event comments.
Correct reading and writing of comments.
Some cleanup in the file info cache class.
More cleanup triggered by a static analyzer.