Inactivate some output in the new kDebug calls

[Matthew Woehlke]

Kleag wrote:
> My 2 cents: I see 2 solutions, one with a second function, the first one with 
> simple output and the other one with complete output. The second solution is 
> using an enum parameter, with a default falue. The problem of this second 
> solution is the existing integer parameter for the channel...

Solution 3 (my preference): use an environment variable, or other 
runtime-configurable method, to control the output.

-- 
Matthew
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