Message 187397 - Python tracker

I will split the "good_load" flag bug into its own issue.

While addressing a bug in #5492, another doubled-up ColorDelegator problem appeared, tracing back to #1586.

The dual_delagators patch removes the code which loads the extra color delegators as well as ensures that ResetColorizer loads a color delegator since ispythonsource() now always returns True in a PyShell instance.