Cycles: support for camera rendering an environment map with equirectangular

environment map, by enabling the Panorama option in the camera.

http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Camera#Panorama

The focal length or sensor settings are not used, the UI can be tweaked still to
communicate this, also panorama should probably become a proper camera type like
perspective or ortho.

intern/cycles/render/camera.h

@@ -19,6 +19,8 @@
 #ifndef __CAMERA_H__
 #define __CAMERA_H__
 
+#include "kernel_types.h"
+
 #include "util_transform.h"
 #include "util_types.h"
 
@@ -44,8 +46,8 @@ public:
 	uint blades;
 	float bladesrotation;
 
-	/* orthographic/perspective */
-	bool ortho;
+	/* type */
+	CameraType type;
 	float fov;
 
 	/* clipping */