Added some comments to the spice files.

compiler/modules/dff_buf.py

@@ -21,7 +21,8 @@ class dff_buf(design.design):
             dff_buf.unique_id += 1
         design.design.__init__(self, name)
         debug.info(1, "Creating {}".format(self.name))
-
+        self.add_comment("inv1: {0} inv2: {1}".format(inv1_size, inv2_size))
+        
         # This is specifically for SCMOS where the DFF vdd/gnd rails are more than min width.
         # This causes a DRC in the pinv which assumes min width rails. This ensures the output
         # contact does not violate spacing to the rail in the NMOS.