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_interface.c

@@ -0,0 +1,85 @@
+
+#include <Python.h>
+#include "compile.h"		/* for the PyCodeObject */
+#include "eval.h"		/* for PyEval_EvalCode */
+
+#include "bpy_compat.h"
+
+#include "bpy_rna.h"
+
+
+/*****************************************************************************
+* Description: This function creates a new Python dictionary object.
+*****************************************************************************/
+
+static PyObject *CreateGlobalDictionary( void )
+{
+	PyObject *dict = PyDict_New(  );
+	PyObject *item = PyUnicode_FromString( "__main__" );
+	PyDict_SetItemString( dict, "__builtins__", PyEval_GetBuiltins(  ) );
+	PyDict_SetItemString( dict, "__name__", item );
+	Py_DECREF(item);
+	
+	/* Add Modules */
+	item = BPY_rna_module();
+	PyDict_SetItemString( dict, "rna", item );
+	Py_DECREF(item);
+	
+	
+	return dict;
+}
+
+static void BPY_start_python( void )
+{
+	PyThreadState *py_tstate = NULL;
+	
+	Py_Initialize(  );
+	
+	//PySys_SetArgv( argc_copy, argv_copy );
+	
+	/* Initialize thread support (also acquires lock) */
+	PyEval_InitThreads();
+	
+	// todo - sys paths - our own imports
+	
+	py_tstate = PyGILState_GetThisThreadState();
+	PyEval_ReleaseThread(py_tstate);
+	
+}
+
+static void BPY_end_python( void )
+{
+	PyGILState_Ensure(); /* finalizing, no need to grab the state */
+	
+	// free other python data.
+	
+	Py_Finalize(  );
+	return;
+}
+
+void BPY_run_python_script( const char *fn )
+{
+	PyObject *py_dict, *py_result;
+	char pystring[512];
+	PyGILState_STATE gilstate;
+	
+	/* TODO - look into a better way to run a file */
+	sprintf(pystring, "exec(open(r'%s').read())", fn);
+	
+	BPY_start_python();
+	
+	gilstate = PyGILState_Ensure();
+	
+	py_dict = CreateGlobalDictionary();
+	
+	py_result = PyRun_String( pystring, Py_file_input, py_dict, py_dict );
+	
+	if (!py_result)
+		PyErr_Print();
+	else
+		Py_DECREF( py_result );
+	
+	PyGILState_Release(gilstate);
+	
+	BPY_end_python();
+}