making the phem path an additional search path, fixing configs at least for the workdir == configdir, refs #21, #1510

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17364 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adapting tests to new phem search path and config handling, refs #21, #1510

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17365 29f149b2-0c63-11e1-8f5c-a347f6a9acd0