Feature: More helpful QA errors-only page

[citizenrich]

Right now the report qa.min.html shows all information, warnings, and errors. When troubleshooting a large number of build errors it would be helpful if the 'See Errors Only' actually only showed errors, rather than nearly all the same information as the full qa report.

[grahamegrieve]

so I thought that the view only shows errors; that's how I wrote it and how it's described. But unaccountably, the code says:

for (ValidationMessage vm : uniqueErrors) {
      if (vm.getLevel() != IssueSeverity.INFORMATION) {
        return true;
      }
    }

Apparently I wrote it like that, but it should just be errors, not errors and warnings