Show Activities panel with new errors

From ticket #10914. We now show the Activities panel whenever an activity ends with an error. To test:

 - Try to delete a partial MIF. Activities panel is not shown during the delete but IS shown when the delete ends with an error.
 - Try to chgrp a partial MIF. Activities panel is shown during chgrp, but if you click away from the panel it will be hidden and should be shown again on chgrp failure.
 - Successful completion of any Activity (delete, chgrp, script) should not show Activities panel if hidden (no change in behaviour).