Fixed bug #50162.
Replaced ctype_digit function because of a failed condition if the parameter is no string.
Updated documentation.
Updated to version 0.9.4

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/datamints_feuser/trunk@79565 735d13b6-9817-0410-8766-e36946ffe9aa