naming changes

path -> filepath (for rna and operators, as agreed on with elubie)
 path -> data_path (for windowmanager context functions, this was alredy used in many places)

release/scripts/io/netrender/utils.py

@@ -215,7 +215,7 @@ def thumbnail(filename):
         scene = bpy.data.scenes[0] # FIXME, this is dodgy!
         scene.render.file_format = "JPEG"
         scene.render.file_quality = 90
-        bpy.ops.image.open(path = filename)
+        bpy.ops.image.open(filepath=filename)
         img = bpy.data.images[imagename]
         img.save_render(thumbname, scene=scene)