cleanup testSupply
Describe expected behaviour of getBaseUnitPrice

At least this is the behaviour expected in my understand
Copy base unit price on movement
reset base unit price when reseting price
Paths should not lookup base unit price
Simulation movement should not lookup base unit price
Supply Lines from draft trade condition should not apply

In some configurations this might be incorrect, but for most cases it is not a
good idea that a price that is currently beeing edited gets applied.
An alarm to check Item tracking consistency
Consistency tab: make a link to the constraint that emitted this message
Delivery line report: fix proxy field in dialog
Allow to set the payment transaction group on an accounting line