GCS: Refactor and additional debug information
GCS: Refactor and additional debug information

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In maximum verbose debug mode, information is given about the groups of Sketcher Constraints that the solver is considering for redundancy or conflict.

This is before the popularity contest selects the constraint shown in the solver messages.

The main reason for showing this is to enable to diagnose problems with sketches in which the constraint indicated as the redundant one appears not to
be the right one. Intended for power users with "iteration level" debug mode.

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