PWD is only set in shell sessions, use os.getcwd() instead
PWD is only set in shell sessions, use os.getcwd() instead

This fixes jobTree failing when run from an IDE such as PyCharm

benedictpaten/sonLib,adderan/sonLib,adderan/sonLib,benedictpaten/sonLib,benedictpaten/sonLib,adderan/sonLib,benedictpaten/sonLib,benedictpaten/sonLib,adderan/sonLib,adderan/sonLib