* Implemented Python's iterator protocol in Interface0DIterator and

orientedViewEdgeIterator.

* Simplified Python-related error handling in C++ class definitions.
The definitions of the following C++ methods were simplified and most
code segments using the C/Python API were moved to Director.cpp.

  ChainingIterator::init()
  ChainingIterator::traverse()
  UnaryPredicate0D::operator()()
  UnaryPredicate1D::operator()()
  BinaryPredicate0D::operator()()
  BinaryPredicate1D::operator()()
  UnaryFunction0D::operator()()
  UnaryFunction1D::operator()()
  StrokeShader.shade()

* Moved part of the introspection-based automatic type conversion code
from BPy_Interface0DIterator.cpp and Director.cpp to BPy_Convert.cpp
for the sake of better code organization.

* Fixed an uninitialized member in StrokeVertexIterator___init__().

source/blender/freestyle/intern/python/Interface0D/BPy_ViewVertex.cpp

@@ -145,7 +145,7 @@ PyObject * ViewVertex_edgesBegin( BPy_ViewVertex *self ) {
 		Py_RETURN_NONE;
 		
 	ViewVertexInternal::orientedViewEdgeIterator ove_it( self->vv->edgesBegin() );
-	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it );
+	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it, 0 );
 }
 
 PyObject * ViewVertex_edgesEnd( BPy_ViewVertex *self ) {
@@ -153,7 +153,7 @@ PyObject * ViewVertex_edgesEnd( BPy_ViewVertex *self ) {
 		Py_RETURN_NONE;
 		
 	ViewVertexInternal::orientedViewEdgeIterator ove_it( self->vv->edgesEnd() );
-	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it );
+	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it, 1 );
 }
 
 
@@ -168,7 +168,7 @@ PyObject * ViewVertex_edgesIterator( BPy_ViewVertex *self, PyObject *args ) {
 	
 	ViewEdge *ve = ((BPy_ViewEdge *) py_ve)->ve;
 	ViewVertexInternal::orientedViewEdgeIterator ove_it( self->vv->edgesIterator( ve ) );
-	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it );
+	return BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator( ove_it, 0 );
 }