glue/setup.py: use stream.write not print >>

    - print >> doesn't work with later versions of python
glue/setup.py: fix setup.py install --user

    - install.prefix variable only exists if --prefix argument given
      explicitly, install_platbase is the better version
setup.py use setuptools if available

    - try/except imports setuptools if its there
    - if setup.py was run by pip, an exception is raised if setuptools
      isn't there, otherwise, old distutils is fine
setup.py: add helpful env message

    - announce end of install with a message on how to use the env setup
      scripts
lalframe.frread: fix bug in get_steam_xxx