Move dup edit code to edit.jsp
Add headers for register.jsp
Remove dup Content-Type

Prohibit local changes on /configkeyring
Remove local keys from keyring on tunnel shutdown or encryption disable
Ensure subsession encryption setting matches primary session
(ticket #2108)

Move clearExcess() call to the cleaner task
Debug/log tweaks

Better resource cleanup

More test targets

Better error handling
Comment out some unused things, misc. cleanups

in prep for a rewrite for tokenizing

Change HeaderLine encoder to work on chars, not bytes,
so multibyte chars aren't split across lines.
Fix places where lines were one or two chars too long.
More to do, as it isn't tokenizing.

Support RFC 5987/6266 for attachment and save-as filenames
Add alt tags for images

- Workaround on receive side for CC bug
- Display To and CC lists on show page
- Case-insensitive handling of all mail headers
- Early return if state is AUTH
- Escape leading '-' in q-p encoding