New viewhelper to get a single entry inside a fluid template

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/nn_address/trunk@85536 735d13b6-9817-0410-8766-e36946ffe9aa
git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/nn_address/trunk@85537 735d13b6-9817-0410-8766-e36946ffe9aa
Manual and version changes

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/nn_address/trunk@85538 735d13b6-9817-0410-8766-e36946ffe9aa