[TYPO3-core] Introducing a BE rootline cache

[Martin Kutschker]

Hi!

This is a SVN patch request.

Branch: trunk

Issue: The BE tries to get the rootline for a given page id again and again 
(eg in the "new element" wizard). This create quite a large number of 
unnecessary DB requests.

Solution: Use a cache during a page request.

This is not a bug, but it's not much of a feachure either, so I ask for 
inclusion in 4.1.

Masi
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