i18n 6.x-1.0-beta3

Some new features and many bug fixes:
- Partial fix for node view forcing selection mode, #283839
- Fixed multiple taxonomy translation issues, by japanitrat, #292232
- Added some basic functionality to i18nviews module, wip
- Some clean up of update scripts, removed obsoleted functions.
- Moved selection mode initialization out of hook init, to first time it's needed.
- Fixed some issues with taxonomy and query rewriting rewriting, by vingbord, #260156 and #260151
- Fixed wrong data type in schema, by polarbear128, #289027
- Fixed issue with synchronization and empty fields as array (files)
- Added back CCK syncronization, by drewish, #293019
- Added new 'mixed' language selection option, by ablivio, #203798
- Moved language icons to a new project, http://drupal.org/project/languageicons