named warnings & individual warning control

[DJ Delorie]

> ... or, on the other hand, you might not enjoy it.  Or reading
> through all the messages this produces might take up all the time
> you have for this project :-).

It took me a whole day to read the ones I found.  The problem is, we
keep discussing it but never do anything about it, and people keep
complaining that we don't have it.  It's been ongoing for at least six
years now.