transactions.py

ROHD-1124: during the rollout of LOFAR-Release-3_1_6 we replaced the radb trigger functions in production with the new functions in SAS/ResourceAssignment/ResourceAssignmentDatabase/radb/sql/add_functions_and_triggers.sql from svn. We forgot that these functions in production had a check to ignore cep4 storage resource, causing problems in scheduling. With this changeset, we (again) ignore cep4 storage claims if they fit. Also added a comment on ideas for faster/better/simpler filling the resource_sage table.