As javadoc is apparently now fixed on the archs where it failed, revert most of
dfa1ea35: keep installing the resulting api documentation.

  * Bindings/Java/Makefile.in: Do not build doc by default.
  * debian/control: Add a libbrlapi-java-doc package to ship the java brlapi
    doc as an arch:all package.
  * debian/rules: Build and install doc in the binary-indep target.

  * Bindings/Python/Makefile.in: Include /usr/share/python/python.mk and
    pass $(py_setup_install_args) setup.py to keep proper installation paths
    (Closes: Bug#571274).

  * Bindings/Python/brlapi.pyx: Apply upstream r4991 to fix an uninitialized
    field in python exception handling (Closes: Bug#568512).

r4495: The Java bindings should load the JNI part automatically.