[Swan] \n in DBG_log

[D. Hugh Redelmeier]

I think that \n in DBG_log is pointless.

When I do
	find * -name '*.[ch]' -print0 | xargs -0 -r egrep -n '\<DBG_log.*\\n\>'

I get about 100 hits.  That doesn't count cases where the format is on another line.

This should be tidied up.