Delete mif handling 10806

This adds a UI for notifying a user if they attempt to partially delete MIFs.

NB: This PR is on top of https://github.com/openmicroscopy/openmicroscopy/pull/1092.

To test, 
 - Choose 1 or more images from a MIF (not all) and try to delete them.
 - You should see a useful notification of this in the activities panel.