blitz: Clean up Timestamp and use joda Instant

Don't construct Timestamp using java.sql.Date or java.util.Date classes;
instead, use Instant to ensure it's in UTC.  The existing uses of these
classes was solely to get the time in milliseconds, which is the main
purpose of joda Instant.
Fix OMERO.matlab delete functions using omero.cmd.DoAll

Replace deprecated queueDelete() list using omero.cmd.DoAll() and add list of
delete commands to the DoAll requests
Merge pull request #1382 from rleigh-dundee/timestamp-cleanup

blitz: Clean up Timestamp and use joda Instant
Update develop submodules
Merge pull request #1396 from snoopycrimecop/merge/develop/submodules

Update develop submodules
Merge pull request #1387 from sbesson/rebased/develop/11168_matlab_delete

Fix OMERO.matlab delete functions using omero.cmd.DoAll (rebased onto develop)