fix getValidChilrenTypes in GMEConcepts

getMETAAspectMergedValidChildrenTypes
performance fix

remove unnecessary _client.getPointerMeta(childID,
CONSTANTS.POINTER_SOURCE) &&
_client.getPointerMeta(childID, CONSTANTS.POINTER_TARGET) &&
calls because of performance issue
getChildrenRelIds bugfix - inheritance...
Merge remote-tracking branch 'upstream/demo' into issue/10 #10