Fix: Missing implementation of INodeList::Sort in HangList.
Feature: New sort method in INodeList implemented in child classes. Use a callback to sort using usort.

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ics_libnavitia/trunk@79093 735d13b6-9817-0410-8766-e36946ffe9aa