Move request-specific description to GraphControl class
Fix 'invalid value' error on failed MIF delete. See #10900
Split error report generation into separate method

- Keep default error generation using response parameters in CmdControl
- Overload create_error_report() in Chgrp and Delete commands to handle MIF exceptions
Modify report and display Import size (see #10875)
Add filter button (see #10875)
Add 2-Fileset delete tests - both failing

This is the equivalent of what we have in chgrp.py. If a delete is blocked by
2 filesets, both should be returned in the rsp.constraints['Fileset')
Add component to display. Layout to be reviewed.
Do not allow to cancel during scanning.
Add extra message to checksums (see #10898)
Modify layout and action's text (see #10877)
Modify cancel method.
Review close action.
Check import result type.
MIF delete message: 'You tried to delete 1 image...'
Removing javascript for fileset thumbs
Handle empty list returned by Import candidates.
Remove unused code.
Close reader.
Remove unused code.
merge develop -D org -I include -E exclude: PR 991 (Add support for Ice 3.5 (develop))