Fix meaning of the only_ways field (fixed cgrun057(normal) in validate)
The default setting for only_ways was , which meant "all ways". However, it's really useful to have  mean "no ways". In cgrun057 I used only_ways(prof_ways) to mean "only run this in the profiling ways", but if profiling is disabled then prof_ways =  and this doesn't do what we want. Profiling is normally disabled in validate, but I had it enabled because I was testing profiling. So now only_ways defaults to None, which means "all ways", and  now means "no ways".
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