Do not look up ReferenceDatabases by alias

[SolomonShorser-OICR]

There is a possible issue where the program tried to create references to a ReferenceDatabase by its alias. The cache and look-up system should only consider primary names of ReferenceDatabases. Aliases should probably not even be loaded into the cache.

In practice (until this possible bug is investigated and fixed): If you have 2+ entries in the reference-databases.xml for versions of the same database, as well as an entry for the database in a general sense, avoid using the general name as an alias for the more specific reference databases.