Various minor import fixes

To test, verify that builds are green and the issues reported in the following tickets are resolved:

http://trac.openmicroscopy.org.uk/ome/ticket/10971
http://trac.openmicroscopy.org.uk/ome/ticket/11513
http://trac.openmicroscopy.org.uk/ome/ticket/11148
http://trac.openmicroscopy.org.uk/ome/ticket/11265
http://trac.openmicroscopy.org.uk/ome/ticket/11286
http://trac.openmicroscopy.org.uk/ome/ticket/11509