This reverts commit 2f06edf4.

The first one found is just good enough.

relative_url has to be passed to SoftwareInstance_bangAsSelf

This is really *interesting* column.

...except already destroyed or being destroyed.

There could be big difference between ordering an instance and finding a
partition.

So in order to reflect real setup time set order's start date to moment when
partition has been found.

This reverts commit db776b07.

More then one builder can be called in same time for same invoice.

Delivery is stopped so invoice simulation WILL be present.

Let the activity system chose randomly what to do.