The attached patch refactors python/hook.in so that there are no
individual function calls to load pretty printers and xmethods. This
was suggested by Tom here:
https://gcc.gnu.org/ml/gcc-patches/2014-08/msg02589.html. He indicates
that it is better to put as little as possible in the hook file. The
attached patch removes all code which explicitly loads the hooks from
hook.in.

2014-09-29  Siva Chandra Reddy  <sivachandra@google.com>

        * python/hook.in: Only import libstdcxx.v6.
        * python/libstdcxx/v6/__init__.py: Load printers and xmethods.