[Dovecot] compact folders, expunge, etc

[Mail Admin]

Test58 and test59 breaks "compact folders" and "expunge" in thunderbird
and evolution.  Messages marked for deletion just sit there as if
compacting folders or expunging have no effect.

Thunderbird continues to behave erratically with dovecot test builds.  I
haven't been able to test the imap_client_workarounds=tb-negative-fetch
option yet as I'm still running test52.  Thunderbird displays blank
messages when they are opened, but "Edit as new" shows the message
contents.  Thunderbird also displays messages that appear to be
truncated like:

> Hi Peter,
>
> I will not This body part will be downloaded on demand.

Thanks,
Derek