SW-657: simple priority sorting for new python3 changes, simplified canProduceNextJob method to simple lookup of a single scheduled job

SW-658: replaced SOAPpy by python3 compliant package pysimplesoap. Adapted ingestmomadapter to use pysimplesoap. Added test t_ingestmomadapter to tests soap functionality.

SW-402: merged ltastorageoverview from trunk into LOFAR-Release-3_1 for deployment to production as per request by SOS/SDOS

SW-402: copied srm_url addition to event dict from ltastorageoverview branch into release branch, so yan can use it for an sdc demo

SW-283: pass along the srm_url from the dataproduct notification to the task notification if possible

ROHD-741: keep track of which export_id's were removed, so we don't have to remove them again. this keeps stuff flowing faster

Task #11385: JIRA LSSS-291: use supervisor to restart service when no active session avaible on qpid broker

Task #11385: JIRA LSSS-291: improved overall throughput by running slow small files and fast big files in parallel

Task #11385: mail to seperate to/bcc adresses. only mention 'could not find mail adresses' remark in successful mails

Task #11385: check for valid sip before transfer. block dataproducts with invalid sip. various minor performance improvements

Task #11245: when resubmitting one job file, the whole group is now loaded, so the reports are about the whole group

Task #11208: from now on, ingest reports dataproducts which failed to transfers as failed to MoM (instead of as 'produced', which had it's reasons, but was very illogical

Fix merge conflict on momqueryservice.py. Moved on trunk, but changed on this branch.
Solve by replacing the moved file with the changed file (thus, move the changed file over the moved file).
Careful checking of (JD's) changes shows this is correct; the changes are preserved.
Other moved files did not cause conflicts, since they were not changed.

Task #10339: remove export job from ingest queue if not found anymore in mom. resubmit messages for failing status updates.

Task #10339: split MoMQueryService into client and server part. Made LTAIngestAdminServer only dependent on MoMQueryServiceClient so we don't run an extra momqueryservice on the lexar3/4

Task #10339: it's not exactly clear what happened to the 2_20 branch, but many changes in LTAIngest from 2_19 were lost. Did a manual merge from 2_19 branch into this 2_20 branch for LTAIngest and SAS/DataManagement