LVS: CustomComparer not working

[klayoutmatthias]

This is related to the following discussion:

https://www.klayout.de/forum/discussion/1821/how-to-create-a-genericdeviceparametercompare-subclass-for-lvs#latest

The CustomComparer isn't working because it's only installed on the extracted netlist and not on the schematic. Hence symmetry is broken and the internal error happens.

Technically the problem is that the extracted netlist's comparer is not copied to the schematic netlist because "clone" isn't available for scripted comparers.

In addition, the the "equal" method is redundant as - within the strict weak ordering - "equal(a,b)" is identical to "!less(a,b) && !less(b,a)".