adapting to boost structure, adding old docs (to be improved), drop reliance on calloc

src/python/module.cpp

@@ -0,0 +1,35 @@
+// Copyright 2015-2016 Hans Dembinski
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/python/module.hpp>
+#ifdef HAVE_NUMPY
+# define PY_ARRAY_UNIQUE_SYMBOL boost_histogram_ARRAY_API
+# define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
+extern "C" {
+# include <numpy/arrayobject.h>
+# if PY_MAJOR_VERSION >= 3
+static void* init_numpy() { import_array(); return NULL; }
+# else
+static void init_numpy() { import_array(); }
+# endif    
+}
+#endif
+
+namespace boost {
+namespace histogram {
+  void register_axis_types();
+  void register_histogram();
+}
+}
+
+BOOST_PYTHON_MODULE(histogram)
+{
+#ifdef HAVE_NUMPY
+  init_numpy();
+#endif
+  boost::histogram::register_axis_types();
+  boost::histogram::register_histogram();
+}