Minimize new refs produced by validateWithRef

• For tests using validateWithRef, only the preprocessed stdout is written out on failure. Standard preprocessors would filter out the summary tables, which is why the counter tables, TTree and histogram summaries are extracted and written out at the end. In this way irrelevant lines would not be part of the ref files, thereby reducing diffs and conflicts.
• Fix a bug in the counter extraction where any component (tool) with a dot in the name would not be considered in the comparison.
• Catch exceptions in the validators and put the traceback in a validator_exception field.
• Expose the counter parsing with a standalone extract_counters.
• Add a preprocessor GroupMessages that groups multi-line messages.
• Add a preprocessor BlockSkipper that improves upon the BlockSkipper from Gaudi (can be moved there).

goes together with Moore!339 (merged)

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/ci-test --merge Moore!339 (merged)

assigned to @rmatev

Sounds really good ! It goes nicely into the direction we wanted to take for long, which is to distinguish structured data (counters, histograms, etc) from raw stdout. Ultimately they should go to their own file with their own (structured) format, but at least this is one step forward.

Looks great, thanks a lot.

mentioned in merge request Rec!1838 (merged)

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mentioned in merge request Rec!1817 (merged)

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All looks grand to me, thanks a lot!

unassigned @clemenci, @sponce, and @rmatev

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mentioned in merge request Moore!357 (merged)

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