Better tracebility for skipped steps

[kareefardi]

Description

Steps in OpenLane can be dynamically skipped. For example:

No CLOCK_NET (or CLOCK_PORT) specified. CTS cannot be performed. Returning state unaltered…

However, it is not that simple to trace the skipped steps after a run is finished.

Proposal

Don't have a proposal at the moment. Just highlighting a gap.