update checkout process

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/wrm_cart/trunk@77561 735d13b6-9817-0410-8766-e36946ffe9aa
update payment process

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/wrm_cart/trunk@77566 735d13b6-9817-0410-8766-e36946ffe9aa
update payment process

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/wrm_cart/trunk@77567 735d13b6-9817-0410-8766-e36946ffe9aa