[MlMt] Recent test versions logging a lot of otherwise invisible 'failures'

[Bill Cole]

[Opening confession: I'm a log fetishist. Don't judge me :)]

Recent versions (4378 and 4387) of MailMate have been occasionally 
sending bursts of log messages consisting of a pair for each IMAP 
account with content like:

    Jul 24 12:18:24 deepfield MailMate[15290] <Warning>: parent is a 
standard mailbox: All Messages
    Jul 24 12:18:24 deepfield MailMate[15290] <Warning>: failed for 
imap://[account address]

There's a pair like that for each source account, so for my 10 accounts 
that's 20 log messages in ~5ms, occurring rather randomly but *mostly* 
when I am actively using the computer. Oddly, it doesn't *only* happen 
when I'm sitting at the machine and it isn't associated with any visible 
issues. A single long-running MM process will start spewing shortly 
after launch, maybe keep that up at a rate of hundreds of batches per 
hour for hours (or maybe not,) go quiet for hours or days, and come back 
randomly at hundreds of batches per hour.

Anyone else seeing this? Best way to look is this command in a Terminal 
session:

    syslog  -k Sender MailMate