Cleanup the NEWS.txt for TYPO3 4.6 and add accordant information.

Change-Id: I2f4bd78feaf2e29e064562f7a9181a081ae9e39c
Reviewed-on: http://review.typo3.org/2071
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Steffen Gebert
Tested-by: Steffen Gebert