Fix up incorrect indentation/line-wrap

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1459110 13f79535-47bb-0310-9956-ffa450edef68
Allow concatenated encoded strings provided that the padding is in the correct place.
Detect and report truncated input and badly placed padding

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1459121 13f79535-47bb-0310-9956-ffa450edef68