Generic exit code

This MR adds exit_code as an optional kwarg of the base Sampler class and removes it from the init of the child classes.

I also added the ability to handle this to cpnest.

Further down the line, we should consolidate things like default exit codes and how the samplers interpret the codes.

added Infrastructure Sampling labels

added 1 commit

• 6ad1b89f - Flake fix

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merged

mentioned in commit d57e6f1e

changed milestone to %0.6.8

mentioned in issue #438 (closed)