date 5.x-1.6

- 56397 remove extraneous ';'.
- Get rid of hook_init(), add helper function date_load(), move date.inc constants to date_api.module.
- 153245 fix typo in Date API documentation.
- 151304 include date.inc in theme so it works outside the module.
- 152207 make timezones.inc independent of the event module, needed because not all versions of event module now use it.
- Fix a typo in the new date_unset_granularity() function.
- fix some invalid functions and missing includes for ical date imports in Date Copy.
- 142509 remove deprecated date_set_granularity() function in date_copy and replace it with newer function.
- 138980 fix permissions, use less memory by resetting node cache, and add warning message to turn off email notifications.
- 139454 date display options were not getting saved.