correct examples.
PYTHONPATH is now set in config.[c]sh generated by FairRoot.
cleanup since PYTHONPATH is now set in config.[c]sh.
cmake need some silly spaces otherwise it will issue a warning.

CMake Warning (dev) in CMakeLists.txt:
  Syntax Warning in cmake code at

    /Users/rdm/ShipSoft/FairShip/CMakeLists.txt:231:171

  Argument not separated from preceding token by whitespace.
This warning is for project developers.  Use -Wno-dev to suppress it.

Wish we used a normal Makefile.
fix a bunch of compiler (clang on OSX) warnings.