date 4.7.x-1.6

- 130689 move drupal_get_installed_schema_version inside install() and update() functions
- 137515 fix logic for figuring out when timezone conversion is needed
- 137624 make sure years back and forward store values when set to 0
- 128355 make sure empty to date values are filled in with from date values
- Move css to hook_menu()
- 130611 make sure no html is returned in default theme when dates are empty
- 134587 fix method of stipping undesired granularity out of dates which was generating critical errors
- 133731 make sure items not in granularity array get stripped out of both stored dates and date format strings.
- 123376 fix validation logic when both to and from dates are required
- 126363 add space before UTC so strtotime will work right
- fix calculation of server timezone adj