Changes from 3.9.0alpha1 to 3.9.0beta1

*Kernel:

*Design:
- Implemented enhancement #009270: modify setup wizard to read defaultaccess 
  from site.ini (for url access-type)

*Bugfixes:
- Fixed bug #9142: updatetypedrelation.php throws a lot of PHP warnings.
- Fixed bug #8497: Missing toggle-button-16x16.gif image in standard design.
- Fixed bug #8616: PDF exports with the same filename overwrite each other.
  (Merged from stable/3.8 (3.8.5) rev. 17221)
- Fixed bug #9028: Importing packages fail to set related objects.
  (Merged from stable/3.8 (3.8.5) rev. 17237)
- Fixed bug #7575: eZURLAlias | Using PathPrefix causes wrong index page.
  (Additional fix: rev. 17249)
- Fixed bug #9091: Missing indexes in 3.8.
  (Manually merged from stable/3.8 (3.8.5) rev. 17258)
- Fixed bug #9117: Content class editing is not inside DB transaction.
  (Manually merged from stable/3.8 (3.8.5) rev. 17260)
- Fixed #8644: bug appears when writing INI files 
  while the siteaccess resides in an extension.
- Fixed bug #9260: Include file path contains two slashes in eznotificationeventfilter.php
- Fixed bug #009082: Packages imports fails with objects in multiple locations.
  (Merged from stable/3.8 (3.8.6) rev. 17294)
- Fixed bug #009264: Fatal translation error.
  (Merged from stable/3.8 (3.8.6) rev. 17296)
- Fixed bug #009003: change main location does not update section
  (Merged from stable/3.8 (3.8.6) rev. 17300)
- Fixed bug #009255: workflow/processlist does not set path.
- Fixed bug #009201: Don't show language dropdown box on class/view when there's
  only one language.
- Fixed bug #009253: Sorting class attributes will remove all attribute names.
- Fixed bug #009259: Add Publish button in preview mode.
- Fixed bug #009222: Missing memento keys for workflow processes.