- Now compiles regularly without --with-unfinished-features
- Still experimental though, so be careful.
- Changed command structure a bit, removing the useless -M option.

- Updated documentation.
- Made editheader extension disabled by default

This was broken by previous change. It now properly uses the final version of the message
instead of the original.

It did not use the original message in this case.

lib-sieve: editheader extension: fixed handling of pre-folded header values for added header fields.

lib-sieve: updated rfc2822 header field body verification to exclude non-printing characters (RFC5322).

This change matches identical changes for Dovecot's imap-login and pop3-login.

lib-sieve: vacation: handled FIXME regarding the use of variables in the :handle argument. Variables are now handled correctly.

lda-sieve: fall back to global recipient_delimiter setting if plugin/recipient_delimiter is not set.

Configuration is now only read once at extension initialization.

variables extension: fixed deinitialization problem (unfreed variable scope data) newly found by Valgrind.

lib-sieve: vacation extension: finally added support for using the original recipient in vacation address check.