#811704 Fix broken handling of calendar links that looses track of where you are if you click around too much.

#811704 Fix broken handling of calendar links that looses track of where you are if you click around too much.

#720868 by dereine and KarenS, Fix argument handling for dates outside allowed range so only page views return 404.

Simplify multiday calendar a bit -- we don't need to create all the new date objects when we already have an object with the right values.