* Added visual response to backend module selection in the menus; The class attribute...

* Added visual response to backend module selection in the menus; The class attribute of the menu items is changed when a module is selected. The default stylesheet is modified so this results in the current module being highlighted in the menu.

git-svn-id: https://svn.typo3.org/TYPO3v4/Core/trunk@328 709f56b5-9817-0410-a4d7-c38de5d9e867