Low-level progress messages in setup.log

[Michael A Chase]

log() appears to be called for a lot of progress messages without
LOG_BABBLE.  This causes the messages to be saved in both setup.log and
setup.log.full.  "io_stream::~io_stream called" in io_stream.cc in
particular
adds a lot of bulk to setup.log.

I think I can identify many of those low-level progress messages that would
be better not included in setup.log.  Would you be interested in a patch?
--
Mac :})
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