adding missing module, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16129 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adapting tool tests to new schemata, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16130 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
making edgesInDistricts.py usable from other scripts, refs #12

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16131 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fixing zero emission class name, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16132 29f149b2-0c63-11e1-8f5c-a347f6a9acd0