Cycles: merge of changes from tomato branch.

Regular rendering now works tiled, and supports save buffers to save memory
during render and cache render results.

Brick texture node by Thomas.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Textures#Brick_Texture

Image texture Blended Box Mapping.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Textures#Image_Texture
http://mango.blender.org/production/blended_box/

Various bug fixes by Sergey and Campbell.
* Fix for reading freed memory in some node setups.
* Fix incorrect memory read when synchronizing mesh motion.
* Fix crash appearing when direct light usage is different on different layers.
* Fix for vector pass gives wrong result in some circumstances.
* Fix for wrong resolution used for rendering Render Layer node.
* Option to cancel rendering when doing initial synchronization.
* No more texture limit when using CPU render.
* Many fixes for new tiled rendering.

intern/cycles/render/scene.cpp

@@ -38,7 +38,7 @@
 
 CCL_NAMESPACE_BEGIN
 
-Scene::Scene(const SceneParams& params_)
+Scene::Scene(const SceneParams& params_, const DeviceInfo& device_info_)
 : params(params_)
 {
 	device = NULL;
@@ -55,6 +55,9 @@ Scene::Scene(const SceneParams& params_)
 	image_manager = new ImageManager();
 	shader_manager = ShaderManager::create(this);
 	particle_system_manager = new ParticleSystemManager();
+
+	if (device_info_.type == DEVICE_CPU)
+		image_manager->set_extended_image_limits();
 }
 
 Scene::~Scene()