remove duplicate reaction ids

persist/src/db/12.0.1/fix_db_20180723.sql

+-- issue #461 - duplicates in reaction ids resolved
+update reaction_table r set  idreaction=concat(r.idreaction,'_',r.iddb) from (select idreaction, model_iddb from reaction_table group by idreaction, model_iddb having count(*)>1) t where r.idreaction=t.idreaction and r.model_iddb=t.model_iddb;