cmd/ht: display aggregated test result in overall report
cmd/ht: display aggregated test result in overall report

The total number of passed, failed, errored test is very informative and it was
missing from the overall report generated if several suites are executed.
While at it: Add more color (rainbows and unicorns are still to do).

vdobler/ht,vdobler/ht,vdobler/ht,vdobler/ht