masking compiled files

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15855 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
flagging known bugs image comparison, refs #21, #1179

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15856 29f149b2-0c63-11e1-8f5c-a347f6a9acd0