expand items in report entry_type:eval

[leondz]

This adds counts for skipped and failed evals, and relays totals for both processed and evaluated output counts.

Previously the report eval entry only listed one "total" and it was ambiguous whether or not this was with None outputs, leading to unstable counting.

Now this is clarified:

• passed - number of passing outputs
• fails - number of failing outputs (hits)
• nones - number of Nones from generator/detector
• total_processed - total number of results from the generator/probe processed and passed to the detector
• total_evaluated - total number of target outputs evaluated (for most detectors, this will exclude Nones)

[jmartin-tech]

Testing looks good. This revision reflects a breaking change that impacts report aggregation and html generation for reports generated on version prior to the change.