cody: lvl graph: node, edge, level classes can be overriden

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40158 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: ide info: fixed showing project units only once

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40159 4005530d-fff6-0310-9dd1-cebe43e6787f