CSVlog vs tabs

Now that we've fixed the partial/interleaved log line issue, I have 
returned to trying toi get the CSV log patch into shape. Sadly, it still 
needs lots of work, even after Greg Smith and I both attacked it, so I 
am now going through it with a fine tooth comb.

One issue I notice is that it mangles the log message to add a tab 
character before each newline. We do this in standard text logs to make 
them more readable for humans. but the whole point of having CSV logs is 
to make them machine readable, and I'm rather inclined to think this 
sort of behaviour is both unnecessary and undesirable.  So I'm intending 
to leave it out for CSV logs.

Comments?

cheers

andrew