TYPO3 Core

The cleaner backend does not have a topmenu frame anymore as it was used to be.

There are a lot of functions that were used to check if the topmenu could be used. A few:

• Javascript top.loadTopMenu() -- non existant anymore, maybe we should introduce a small alert ("old extension used, please report to bugs@typo3.org)
• template.php: doc->isCMLayers() => needs to be set to deprecated and set to
• alt_clickmenu.php => Remove unncessary functions

(issue imported from #M8323)