task: add new hook for displaying additional filters in the backend (customFilterFlexformEntry).

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ke_search/trunk@85798 735d13b6-9817-0410-8766-e36946ffe9aa
remove hook for custom filter

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ke_search/trunk@85799 735d13b6-9817-0410-8766-e36946ffe9aa