Chgrp mif handling 10802

If a chgrp fails with Fileset constraints, the filesets are displayed in the Activities panel, showing which images you tried to move and which blocked you.

You are also provided with a 'MOVE ALL' button to repeat the chgrp and include the blocking images.

NB: chgrp with filesets is not working on the server yet, so this PR cannot be properly tested yet - see https://github.com/openmicroscopy/openmicroscopy/pull/1115
Dont' try to move Datasets yet - server may hang.

To test:
 - Choose a Dataset OR a number of images that includes part of a Fileset or parts of multiple Filesets
 - Try to move to a different group. 
 - Should see a message describing which images were chosen from each (multiple) filesets.
 - If you click the 'MOVE ALL' button, the chgrp should be repeated and should succeed, with all the images going to the same Dataset (if chosen - otherwise orphaned).
 
![screen shot 2013-05-05 at 00 35 03](https://f.cloud.github.com/assets/900055/463069/4e7efdec-b513-11e2-99a8-550479786af0.png)