Zeiss CZI improvements

See http://trac.openmicroscopy.org.uk/ome/ticket/10620 and http://trac.openmicroscopy.org.uk/ome/ticket/10966

There are a ton of new files in ```zeiss-czi/zeiss/zen-2012```; spot-checking a few of them by hand may be helpful, just be aware that several of them are quite large.  For the multi-file datasets listed in ticket 10966, only the "master" file (the one without a number in parentheses) should be opened - everything else will be picked up automatically.