CustomResistorExtraction: show faulty device in GUI

[klayoutmatthias]

This relates to this problem: https://www.klayout.de/forum/discussion/2462/customresistorextraction-show-faulty-device-in-gui#latest

[klayoutmatthias]

Testcase is here:

issue_1608.zip

Quick analysis: for caching purposes, the shape group of the device is normalized, but the transformation is not considered for the error markers. Also, in the presence of warnings or errors, the devices should not be cached.

Code: dbNetlistDeviceExtractor.cc, line 291.