Code review comment for ~bhill/epics-base:db-tpro-show-values

See previous discussion at https://github.com/epics-base/epics-base/pull/20

I personally like the idea of using TPRO to control debug prints. So much so that I've been adding it to my drivers so the last couple of years.

I don't have a problem with overloading TPRO in this way in Base. I would make the threshold numbers it larger (5 and 10).

As this is Base, maybe we should add a new field instead? Is .DDBG taken (aka Device support DeBuG)?