API CHANGE Removed Translatable->isTranslation() - after the new "translation group" model, every page is potentially a translation
API CHANGE Translatable->findOriginalIDs(), Translatable->setOriginalPage(), Translatable->getOriginalPage()
ENHANCEMENT Translatable->getCMSFields() will now always show the "create translation" option, not only on default languages - meaning you can create translations based on other translations
ENHANCEMENT Translatable language dropdown in CMS will always show all available languages, rather than filtering by already existing translations
ENHANCEMENT Added check for an existing record in Translatable->createTranslation()
BUGFIX Removed Translatable->getLang() which overloaded the $db property - it was causing side effects during creation of SiteTree default records.
BUGFIX Added check in Translatable->augmentSQL() to avoid reapplying "Lang = ..." filter twice
BUGFIX Removed bypass in Translatable->AllChildrenIncludingDeleted()
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@73338 467b73ca-7a2a-4603-9d3b-597d59a354a9