CaloClusterCorrection: Cluster correction configuration updates.

Remove CaloRunClusterCorrection, and remove the remnants of it
from the configuration.

Allow reading configuration parameters from a pool file again.

Allow configuring using the global tag again.

Now the sequence of tools is always configured statically, though
their parameters may change during the run.

Switch cluster correction configuration to use new-style configuration,
and new (CompFactory) configurables.

Add a unit test for cluster correction configuration.

Fix flake8 warnings.
Other cleanups.