Exmh Bug Fixes

# Bugs fixed in exmh since 2.0.3

- You can now have more than one exmh running on the same display
- Fixed MIME formatting in Receipt-Notification message
- Fixed encoding of whitespace in header lines
- Restored 'Invoke menu with right button' message on large messages
- Unseen sequence is no longer trashed after a `sort` or `pack`
- Fixed ordering of MIME type guessing; It used to be `mailcap`, `mime.types`, magic, now it is `mime.types`, `mailcap`, magic
- Fixed `mailcap` file extension parsing to ignore entries with `nametemplate=%s`
- Fixed problem in `X-Image-URL` with `~` in pathnames
- Fixed bug in alias editor
- Fixed address-book lookup/expansion to create a new "To:", "cc:" or whatever line so wrapping isn't a problem
- Improved code for posting to newsgroups
- Consistent field width for the count in the Unseen window
- Fixed installation glitch where hitting Verify before Patch would raise an error about an undefined variable
- Added a file create of `.mh_sequences` to the New Folder code
- Fixed small bug in searching body of message
- Fixed bug with compose in empty drafts folder
- Fixed a minor bug in the regular expression for URLs, so `<mailto:foo>` loses the trailing '>' as it should
- Fixed handling of extra parameters on `mailto:` URLs
- Don't display message parts if 1) it's a `text/*vcard`; or 2) it's got a `Content-Disposition: Ancillary` header
- Fixed error in regexps in `ftoc.tcl` where digits followed by a "`+`" would confuse the marking of current message
- Fixed Help...>Color Legend crash
- Made menubuttons and regular buttons the same size when using tkstep
- Fixed the actions for Rescan, Pack, and the various Sorts not to call `Msg_ShowSomething` afterwards. This had the unintended side-effect of, if no current message was set, setting the current message to the first unseen message
- Closing html window during install before the page is fully rendered no longer crashes
- If there's a PGP error while processing the message, show the message raw
- Eliminated extra newline in editnow window
- Sped up startup time by not pre-caching nicknames for all the folders
- Sedit was not inserting `Mime-version` header when it should have
- Allow ispell preferences to work before sedit has been opened
- Fixed problems with annotation settings
- References to `exmh(background)` should have been to `exmh(bgPeriod)` in `BackgroundFixup`
- Fixed `<a HREF="file.html#location">` in HTML browser
- Prompt the user before executing the command portion of a button tag which is either non-local or in `/tmp`