Added some comments to the spice files.

compiler/modules/dff_inv.py

@@ -20,6 +20,8 @@ class dff_inv(design.design):
             dff_inv.unique_id += 1
         design.design.__init__(self, name)
         debug.info(1, "Creating {}".format(self.name))
+        self.add_comment("inv: {0}".format(inv_size))
+
         self.inv_size = inv_size
         
         # This is specifically for SCMOS where the DFF vdd/gnd rails are more than min width.