[MERGE] 1.5? Suppress DeprecationWarning in official releases

[Martin Pool]

Martin Pool has voted tweak.
Status is now: Conditionally approved
Comment:
I think this should be in NEWS.

I think this is a reasonable tradeoff.  I do sometimes run Bazaar with 
-Werror and it would be nice if this did not override the -W flag when 
that is specified, especially for selftest.  But I'm OK to go back and 
fix that later, if it turns out that it is broken.  Perhaps eventually 
the test suite should hook into warnings and specially report them.

I did also wonder if we should treat bzrlib warnings differently from 
those from other libraries but I don't suppose the user would want to 
see them either.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C482C5FAE.8040407%40arbash-meinel.com%3E