[merge] allow setting debug_flags in ~/.bazaar/bazaar.conf

[Martin Pool]

This lets you put lines like this in ~/.bazaar/bazaar.conf

  debug_flags = hpss

and then you'll always get a trace of bzr+ network operations in ~/.bzr.log.

It also removes the suggestion   "(and try -Dhpss if further diagnosis
is required)") which has caused some confusion when people's actual
problem is that the server's unreachable or something.

-- 
Martin <http://launchpad.net/~mbp/>
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