Assorted bug fixes for May

See:

http://trac.openmicroscopy.org.uk/ome/ticket/10887
http://trac.openmicroscopy.org.uk/ome/ticket/10884
http://trac.openmicroscopy.org.uk/ome/ticket/10843
http://www.openmicroscopy.org/community/viewtopic.php?f=13&t=4710#p9964

Pretty much everything else was noticed while doing the ground work for a complete repository testing job for Jenkins.

These are all straightforward reader fixes, so just need verifying that the above listed issues are resolved and that the Jenkins jobs are all green.