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".