Patch from Bastien Kleineidam:

adds the 'install_data' and 'install_scripts' commands; these two
are trivial thanks to the 'install_misc' base class in cmd.py.
(Minor tweaks and commentary by me; the code is untested so far.)

Lib/distutils/command/__init__.py

@@ -11,6 +11,8 @@ __all__ = ['build',
            'build_clib',
            'install',
            'install_lib',
+           'install_scripts',
+           'install_data',
            'clean',
            'sdist',
            'bdist',