pyladies-courseware
                                
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                        Add autonumbering option to course sessions
Fixes https://github.com/messa/pyladies-courseware/issues/175
All sessions from naucse should have serial with a „number“ for humans so the course can be numbered from 0, a number can be skipped, etc.
But serial is a really string: you could also have sessions 3a and 3b for example.
Please use serial if available, otherwise the numbering could be confusingly different between naucse and courseware.
Rebased over stable.