SEQUENCES
---------
-* Change so you can have more than 26 sequences. Unfortunately,
- given the way that the bit flags for sequences work, this is
- not easy.
* Maybe add option gracefully handle empty sequences (-force).
ENVIRONMENT/PROFILE
handling type, such as multipart/mixed.
* add way so user can tell mhn to use a certain `proc' such
as moreproc, for certain content types.
-* add support for Content-Disposition header (rfc1806, rfc2183).
* merge the two places in which mhshowsbr.c reads display
strings.
* when storing to a folder, should we save the folder context