feature: send email to admin after registration, see http://forge.typo3.org/issues/41705, thanks to Marcus Schwemer

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ke_userregister/trunk@79516 735d13b6-9817-0410-8766-e36946ffe9aa
some code cleanup (no functional changes)

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ke_userregister/trunk@79524 735d13b6-9817-0410-8766-e36946ffe9aa
some code cleanup (no functional changes)

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/ke_userregister/trunk@79526 735d13b6-9817-0410-8766-e36946ffe9aa