`counter` does not default to `id`

[icornelius]

The help for --counter states "defaults to --id if present". In fact, there is no inheritance from --id. counter cannot be called by --name unless a counter value has been supplied with --counter. For instance

zettel --set-title "This is a test" --id foo --name id counter timestamp

Generates the error message

--name ['id', 'counter', 'timestamp'] requires --counter