org: add a first code example
The difficulty is not the example, but setting up org-mode to allow Python and C++ example that use the local libraries, not those installed system-wide. * doc/org/.dir-locals.el: Rename as... * doc/org/.dir-locals.el.in: ... this, so we can easily define PYTHONPATH and other environment variables. * doc/org/init.el.in: Enable C++, and make sure but Python and C++ use the local libraries. * doc/org/g++wrap.in, doc/org/tut01.org: New files. * doc/Makefile.am, configure.ac: Adjust. * wrap/python/spot.py (to_str): Take a parenth argument.
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