primary term query is slower than necessary because un-indexed

[dosumis]

1. Add Entity label to all classes and Individuals: https://github.com/VirtualFlyBrain/VFB_neo4j/pull/108/files

2. Change XMI query to restrict to Entities (step 1 is dependency)

https://github.com/VirtualFlyBrain/geppetto-vfb/blob/vfb_geppetto_application/model/vfb.xmi#L362

name="Get term core info"

MATCH (primary {short_form: '$ID'}) 
RETURN { core: { short_form: primary.short_form, 
label: primary.label, iri: primary.iri, types: labels(primary) }} AS term

=>

MATCH (primary:Entity {short_form: '$ID'}) 
RETURN { core: { short_form: primary.short_form, 
label: primary.label, iri: primary.iri, types: labels(primary) }} AS term