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Add Janek's stubs for 'problem statement'
switch order

version control is the central topic of this paper, so i think it should
go first (and it should be more appealing to readers than 'daunting' text
files).

In fact, plain text is important for us mostly because it faciliates version
control.
Add comment to work-flow section
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merge Urs addition
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WIP (Crowd editing section)