Marc Juchli

Ability to exclude dependency packages from DAR

1

### What is the problem you want to solve? Currently, `dependencies` and `data-dependencies` will include the corresponding packages when building a `dar`. As a result, the `dar` becomes self-sustaining, which...

The helper function `mustBe` ([definition](https://github.com/digital-asset/daml-finance/blob/main/src/main/daml/Daml/Finance/Settlement/Instruction.daml#L61)) generates an error message which expresses that a given party doesn't match the expected party (for a given field): ``` 'partyA::...' must match 'partyB::...'(Custodian) ```...