Offer new morePopoverClose callback option

[yenoiwesa]

Adding an option to map a callback that gets called when the more popover window is closed.
The new option is named morePopoverClose.

Feature request #6593

[JoabeFerri]

Would you have a function that makes the popover close when you click on the meeting or event? @acerix

For example, when clicking on meeting the popover must close