Hot fix: queries for classified *and unclassified* opinion references from a very large list would lock up the database, because of an 'or' that shouldn't have been there. Changed the code to split the queries in two in this case.
Hot fix: queries for classified *and unclassified* opinion references from a very large
list would lock up the database, because of an 'or' that shouldn't have been there. Changed
the code to split the queries in two in this case.

paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new