#153. Post data processing refactoring, some changes in form functional.
#153. Fixed issue with null value, post form refactoring completed.
#153. Statistics slightly refactored.
#153. Added commas into arrays, removed empty lines after function body start
#153. Backmerge with master.
#153. Backmerge with master. Fixed metabox.
#153. Sanitizer fixed.
#153. Minor changes in statistics forms.
#153. Fixed errors on frontend.
#153. Pricing tab category default price setting refactored.
Fixed tabs height in debugger
added support for php 5.2 in logger. implemented proccessor-interface #406
#406 yay
Merge pull request #415 from laterpay/feature/406_logger_php52_support

added support for php 5.2 in logger

Closes #406
implemented purge_cache to Cache-Helper, added new actions to purge cache on update_option, added purge cache on change for external database-tables #401
#401 whitespace
Merge pull request #416 from laterpay/feature/401_purge_cache_on_settings_update

implemented purge_cache
Fixed url of background-image
Hackish fix for layout diferences in webkit
Something must have changed but I don't know what