improve ways to enter 'Parameter Name

[proccaserra]

Reported by Kenny Billiau on ISAforum:

"how do I easily add multiple study protocol parameters with ontology terms without resorting to the freetext description?"

While the Parameter Name field is wired up to the Ontology widget, reporting more than one value can only be done via free text

[sneumann]

Seconded, I ran into that today as well. Yours, Steffen