Python RNA API

* Matches the C/RNA api structure
* Thin wrapper ~(600 lines)
* No functions specific to any blender object type.
* Defines 2 types, BPy_StructRNA and BPy_PropertyRNA.
* Python 3.0 target (compatible with python 2.4,5,6) 
* http://wiki.blender.org/index.php/BlenderDev/Blender2.5/PyRNA - continue docs/discussion here.

Todo
* Collection iterators
* Write access to data
* Define how constants should be accessed (as strings or some special type)
* Solve the "Python keeping invalid blender pointers" problem.
  This cant just be solved in the py api - we need blender to notify when ID's are removed 

Examples
Here are some examples that work with the current implementation of the api.

 rna.lamps["Lamp.006"].energy -> (1.0)
 rna.lamps["Lamp.007"].shadow -> ("NOSHADOW")
 rna.materials.keys() -> ['flyingsquirrel_eye', 'frankie_skin', 'frankie_theeth']
 rna.scenes["hud"].objects["num_text_p2_4"].data.novnormalflip -> False
 rna.meshes["mymesh"].uv_layers.keys() -> ['UVTex', 'UVTex']
 rna.meshes.items()

For a dump of yo-frankie level see - http://pasteall.org/3294/python

Notes
* Added python back, can only execute scripts from the command line with -P script.py
* bpy_interface.c is just enough functionality to run a python file.

source/blender/python/intern/bpy_compat.h

@@ -0,0 +1,49 @@
+/**
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * Contributor(s): Campbell Barton
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/* This file is only to contain definitions to functions that enable
+ * the python api to compile with different python versions.
+ * no utility functions please
+ */
+
+/* if you are NOT using python 3.0 - define these */
+#if PY_VERSION_HEX < 0x03000000
+#define _PyUnicode_AsString PyString_AsString
+#define PyUnicode_Check PyString_Check
+#define PyLong_FromSize_t PyInt_FromLong
+#define PyLong_AsSsize_t PyInt_AsLong
+#define PyLong_Check PyInt_Check
+#define PyUnicode_FromString PyString_FromString
+#define PyUnicode_FromFormat PyString_FromFormat
+
+#endif
+
+/* older then python 2.6 - define these */
+// #if (PY_VERSION_HEX < 0x02060000)
+// #endif
+
+/* older then python 2.5 - define these */
+#if (PY_VERSION_HEX < 0x02050000)
+#define Py_ssize_t ssize_t
+#endif