Common: ConfKey align prov + print hash

[f3sch]

The first change is of course just a visual aid but the second one I find useful for quick comparisons of parameters (and the machinery was anyways there). Let me know what you think.

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[sawenzel]

Thanks. This is a good idea. I just have a minor comment on variable naming.

[f3sch]

Thanks for the review! (There are only two things hard in programming; cache invalidation, naming things and off by one errors :)).