Fix the links and javascript in the list view to fix deleting a specific meeting

To delete a specific meeting in a recursion we split the recursion into
two and drop the meeting in the middle.
But to do this, we need to know the from_date argument.

The agenda view had this working but for some reasons it was missing from
the list view.
When deleting a meeting, find the next occurrence and forward it to the template
Update the delete_meeting template

Show the date of the meeting that will be deleted as well as the date
of the original object/meeting as stored in the database
Adjust the unit-tests for the fix in the list view (forwarding the from_date)
No need to restrict the updating of recursive meetings to the future

Without lifting this restriction, we are no longer able to delete meeting
from the past that occurred as part of a recursion.
Merge pull request #153 from fedora-infra/fix_delete_in_list

Fix delete in list