buildKeyword placed every user-supplied item into a single DeckRecord,
so multi-record keywords such as TUNING (3 records, each terminated by
its own '/') were emitted with only one record/slash and rejected by the
simulator.
Distribute items across the keyword's records using the OPM ParserKeyword
schema: each item is matched to the record that defines it. Every record
is emitted (empty records are written as a bare '/') so the schema's
record structure is preserved, and items unknown to the schema are now
reported via a warning. Single-record keywords keep their previous
behaviour, including appending non-schema items after the canonical
block.
Kristian Bendiksen
393e52cfdc