existing id handling

[tgbugs]

We should be showing equivalent classes in the lexicon pane. For example
http://matrix.neuinfo.org:9000/scigraph/graph/neighbors/NIFORG:birnlex_113?direction=BOTH&blankNodes=False&relationshipType=equivalentClass&depth=1&project=%2A

We can also use this to populate pages that are empty, so for example if the is no summary for NIFORG:birnlex_113 but there is for NCBITaxon:9685 then when we load NIFORG:birnlex_113 and find nothing we should check to see if there are any edges that come back from the graph query that have edge['pred'] == 'equivalentClass' (in our example this would return NCBITaxon:9685 which we would then look up and discover has a very nice summary that we can use for the equivalent id.

An alternate way to manage this would be to redirect to the identifier with the most highly ranked curie perfix (and that is not deprecated) and show a 'redirected from' like wikipedia does.

[tgbugs]

Redirect to preferred id for all deprecated terms or existing ids. In dataspace and literature records use preferred identifiers when creating the index