merge with trunk/2.5 at r23876

[[Split portion of a mixed commit.]]

release/scripts/modules/bpy_sys.py

@@ -0,0 +1,12 @@
+import bpy
+import os
+
+def expandpath(path):
+	if path.startswith("//"):
+		return os.path.join(os.path.dirname(bpy.data.filename), path[2:])
+	
+	return path
+
+import types
+bpy.sys = types.ModuleType("bpy.sys")
+bpy.sys.expandpath = expandpath