#1096246 Date filter was not apply the group method in the right place in the query, causing that method to be applied to all filters.

Issue #1054458: Move date_increment_round() function into Date API module so it is always available.

Issue #745074, by rsevero: Don't test for valid timezone-adjusted date for dates that don't use time.

Issue #1013662 by developer-x: Remove check for start and end date - this prevented multiday-all day events from showing 'All Day'

Issue #1082658: Saving the options as arrays breaks other things. Add a custom export plugin instead.

More work on new filters and arguments, adding in the fix to include filter and argument option settings in the export.

Issue #1075890 by KarenS: Initial pass at breaking out the code into the simple filter and a complex filter that combines date fields.

Check for empty values as well as missing values for better performance in the Views exposed widgets.

Invalid or empty dates need to replace the form array with an empty string. Also removing some code from date_api_sql that actually doesn't do anything.

The Views Field handling code got totally changed and everything has broken here again. Some commits to temporarily workaround the changes. I probably just have to re-do all the Views handling from scratch to better integrate with the way that Fields and Views now work.