Concept Service getDrugs(String phrase) should not return retired drugs

Currently, the getDrugs(String phrase) method in ConceptService returns retired drugs. This seems to be at least partially by design (there is a @should return drugs that are retired on the interface), but also seems wrong. The expectation here is that a basic search method like this would not return retired drugs. There is also a contradiction here because the old, deprecated findDrugs(phrase, includeRetired) delegates to getDrugs if includeRetired=FALSE.

At minimum, there must be a way to do a search like this and to specify to exclude retired drugs.