Quantifier checks not always looking for RSTR role.

[goodmami]

Pred, ElementaryPredication, and Node components all have an is_quantifier() method, but only in ElementaryPredication does it look for the RSTR role on its arguments (because only EPs have arguments as part of the data structure).

Where the information is available (e.g. in converting from MRS to DMRS), the RSTR role should only be used in determining if something is a quantifier.

We should possibly also deprecate is_quantifier() on Node and Pred, and instead use something like xmrs.nodeids(quantifier=True) in order to get this information. If someone wants to use the generally-but-not-necessarily-true assumption that a Node or Pred with q as the pos value is a quantifier, they can look directly at pred.pos.

[goodmami]

Fixed in 2888d1d. Pred.is_quantifier() and Node.is_quantifier() are deprecated in 39ee95e