[m-rev.] for post-commit review: split possible_cause into hint and inconsistent

[Zoltan Somogyi]

The concept has been agreed and the implementation
is straightforward, so really the feedback I am looking for
is for Peter to pick an updated color scheme. But Peter,
please do not update the code yourself, as I intend to keep
working on the affected modules, and that would cause
a conflict for me.

Zoltan.
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