Partially revert 1c20cfdf2403feb78cef515faf15c04d5c9f17bd

Not clear why update-dbix messed up the Jobsets and Projects classes. This will probably happen again in the future…

Created by  Eelco Dolstra  on October 1, 2014
PCD3ZH6ZMXTB53MASR7SJGAR4HME2TETMTMXSUR5ZMXTB3I3FH3QC
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