Productivization of the trace_account tool

[abizjak]

Task description

Trace-account should be expanded to support all transaction types and be more robust wrt failure.
Possibly it should be expanded to support more source types.

Sub-tasks

• support output in CSV format
• support all transaction types #77
• support querying accounts via credid to get all accounts and not just the ones created by the owner of the credential.

[simonkamp]

Tool moved to use-case-examples