* Installer: Renamed the tab back from "Setup" to "Installer" to avoid problems in...

* Installer: Renamed the tab back from "Setup" to "Installer" to avoid problems in translation tool
* Installer: reorganized installer module (rewrite)
* Installer: implemeted some features for setup module to make it usable for most cases
* Installer: added database checks (big thanks to Francois Suter!!!)
* Installer: started implementation of image checks
* Installer: prepared codebase for third party patches

git-svn-id: https://svn.typo3.org/TYPO3v4/Core/trunk@2929 709f56b5-9817-0410-a4d7-c38de5d9e867