Gets rid of the last class property in this file.

Your brain should pop out through your eyes already: this code is setting
a *class* property. On a class which is used as a base class everywhere in
this file. Mouhaha. *sob*

This code is called during upgrade and shall work without interactions.

This explains speed of migration, doing nothing usually takes not time.
Unfortunately this optimisation has to be dropped.

In Vifib configuration invoices are simple.

It just does not work [tm].

Currently packing lists are created faster, and this test method is used in
tests which are requesting stopped and started instances.

File was edited outside of BT code, so newline was added.

Set Software Instance roles directly from aggregate related object.

Use double interaction, called twice: in order to being able to reset role on
removal or set it on setting.

It allows locating workflow.