Cycles:

* Fix missing update when editing objects with emission materials.
* Fix preview pass rendering set to 1 not showing full resolution.
* Fix CUDA runtime compiling failing due to missing cache directory.
* Use settings from first render layer for visibility and material override.

And a bunch of incomplete and still disabled code mostly related to closure
sampling.

intern/cycles/render/session.h

@@ -58,7 +58,7 @@ public:
 		background = false;
 		output_path = "";
 
-		progressive = false;
+		progressive = true;
 		passes = INT_MAX;
 		tile_size = 64;
 		min_size = 64;