vt730: Calendar UX Improvements

One customer has asked for a few tweaks to the way the Calendar/Shared Calendar views work. These seem to be useful improvements to me.

1. Make the list of users on the left in the Shared Calendar drag/drop orderable by each user.

2. When clicking on a Task or Event in the Calendar/Shared Calendar views, open the record in a modal popup (like when you click the pencil icon), rather than taking the user away from the Calendar completely to the Detail View page. This is a big improvement IMHO. When you are navigated away from the Calendar, any changes to the view (Day/Week/Month) and/or the date-range of the Calendar are lost when you come back after viewing the Detail View of the record.

3. Add a bulk check/uncheck option for the user list (or record/type of event) down the left of the Calendar. When you have a lot of users and/or configured entries unchecking or then checking all items is a PITA.

4. Provide a way to "Duplicate" events when in the Calendar/Shared Calendar views, again without having to leave the view. Support for CRTL+Drag would be intuitive IMHO, plus maybe add an option in the popover markup.

5. When in month view clicking on a day block to add an entry, vtiger does not respect the user's "Day starts at" setting - the new event is always set to 12:00am.