Merged from trunk with revision range 36835-37865,

(No conflicts had to be manually resolved)
Gave weight paint a basic ability to draw edges and vertices with an option
 (with colors for selected/unselected),
but I didn't make any vertex selection functions available in weight paint mode yet
(tested with edit mode for now).

doc/python_api/examples/bpy.props.4.py

@@ -0,0 +1,21 @@
+"""
+Update Example
+++++++++++++++
+
+It can be useful to perform an action when a property is changed and can be
+used to update other properties or synchronize with external data.
+
+All properties define update functions except for CollectionProperty.
+"""
+
+import bpy
+
+
+def update_func(self, context):
+    print("my test function", self)
+
+bpy.types.Scene.testprop = bpy.props.FloatProperty(update=update_func)
+
+bpy.context.scene.testprop = 11.0
+
+# >>> my test function <bpy_struct, Scene("Scene")>

doc/python_api/examples/bpy.types.BlendDataLibraries.load.py

@@ -21,3 +21,19 @@ with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
 with bpy.data.libraries.load(filepath) as (data_from, data_to):
     for attr in dir(data_to):
         setattr(data_to, attr, getattr(data_from, attr))
+
+
+# the 'data_to' variables lists are
+with bpy.data.libraries.load(filepath) as (data_from, data_to):
+    data_to.scenes = ["Scene"]
+
+
+# the loaded objects can be accessed from 'data_to' outside of the context
+# since loading the data replaces the strings for the datablocks or None
+# if the datablock could not be loaded.
+with bpy.data.libraries.load(filepath) as (data_from, data_to):
+    data_to.meshes = data_from.meshes
+# now operate directly on the loaded data
+for mesh in data_to.meshes:
+    if mesh is not None:
+        print(mesh.name)