+Sat Oct 22 22:55:49 EDT 2005 ajc
+* Set a maximum number of messages which may be indexed before we force
+ a cache flush to disk. Currently 2500.
+
Sat Oct 22 00:48:47 EDT 2005 ajc
* msgbase.c: allow multipart/alternative part-swapping only at the top
level, because if we recursed into another one then it's going to stomp