Delegation Manager improvements

[AstroRossD]

The Delegation Manager is an awkward page to use. Here are some suggestions to improve it:

1. Start Date and End Date selection should be optional - allow delegations to be toggled on/off without this, similar to Outlook out of office notifications. This will be faster to set up.
2. It is too easy to duplicate a delegation when editing, if it is saved with the checkbox ticked, it creates a new delegation rather than edits the existing one, this results in conflicts that need to be resolved.
3. The page continually generates "Leave site? Changes that you made may not be saved." messages when closing a browser tab, even if the user saved the settings. Or "500 - Server Error Unknown error." messages.
4. The calendar selection box on the date fields should have a button to select today's date, reviving an old delegation takes a lot of clicks to find a relevant date, or default the fields to today's date if out of range.
5. The delegations list should be sorted by Status by default, so that active delegations are easily visible at the top of the list.
6. Long term, some kind of integration with Outlook could activate delegations when a user has out of office replies on

[richard.valdez]

we should also have the ability to add multiple delegates for one user and one workspace, so when a user is out and there are two delegates, either one can approve for a user.