Improved whitespace

There were lots of trailing spaces and mixed tabs/spaces in .XML, which looked really ugly in my editor.
Whitespace must precede ..<br>Whitespace must follow ..<br>Whitespace must precede ..<br>Whitespace must follow ..<br>Whitespace must precede ..<br>Whitespace must follow ..<br>Whitespace must precede ..<br>Whitespace must follow ..