database cleanup UI glitch

[clonedagain]

The database cleanup objects are Transient Models, so logically he menu items point to a newly created record each time.
But buttons cannot be clicked in the tree-view of o2m fields until the parent object is saved. So for the moment, if you want to purge only one element, you have enter the menu, press "Save" and only then purge the element you want - and you have to guess that for yourself.

[hbrunn]

this was fixed in #158