raw SQL query (but never read afterwards). Workaround for
lp:1277899
[FIX] Preserve dangling workflow table which is in use
[RFR] Group models per table when detecting columns to purge
to prevent problems with models sharing the same table
[ADD] Allow purging of dangling data entries
[FIX] Data purging now working
[IMP] Docstrings
[FIX] Label
[FIX] Catch attempt to unlink field from nonexisting model
[RFR] Flake8
avoid ''NoneType' object has no attribute 'exists'' error when purging models
fix my change guewen.baconnier@camptocamp.com-20140203103254-v1mzu2uib047xb9h, wrong lines replaced...
Anthony Muschang
Stefan Rijnhart
Guewen Baconnier