Added bugtraq properties to all folders to be used by TortoiseSVN, We…

…bSVN and others.

This makes entries like "bug #123" or "Bug #123" clickable in the SVN log.
You are transfered to the bugtracker on gna.org.

git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@625 4a71c877-e1ca-e34f-864e-861f7616d084