#189093 follow up to previous fix of bug that caused Views arguments to disappear, simplify the way Date arguments are created. The previous more complicated handling is a throwback to the way CCK used to work and was never simplified when CCK changed.

#189093 Fix mysterious bug that was causing Views arguments to disappear. It turned out to be coming from a use of content_fields() that was nested inside another call to content_fields() from another function which broke only in certain environments. Much thanks to marcp for providing a database dump of a problem setup that helped me find this elusive bug!

#189093 More reworking of the way views files and functions are included and called to hopefully fix erratic problems of missing arguments.

#189093 Trying a different method of including views files and functions to see if it will fix the mysterious errors reported in numerous issues where arguments disappear.

Get rid of constants for DATE_TIMEZONES and DATE_API_PATH since they sometimes don't get defined before they are needed.

Lots of fixes for the update processes. Get rid of older updates that are re-done in later updates and create a data_integrity and db_integrity update.

#163712 fix some subtle problems in link titles and query parameters when working with partial ISO dates, like only year and month.

#175914 make sure month and day don't get set to zero when creating timestamps to format dates, since zero values will revert to the previous day. Patch by derhasi.

#175914 make sure month and day don't get set to zero when creating timestamps to format dates, since zero values will revert to the previous day. Patch by derhasi.

#160052 make sure no errors are thrown when gmmktime is called and 'all' is one of the arguments. Thanks to mmoreno for the help.

Add reworked ical file as developed for 5.2 version of date module. This file can parse many additional parts of the ical file and won't mistakenly perform timezone conversions on imported data.