Log Message:
mutt: Update to version 2.2.0

Changes since version 2.1.5:
+ $pager_skip_quoted_context determines the number of lines to show
  before unquoted text when using <skip-quoted> in the pager.
! Quadoption prompts and a few boolean prompts now have a '?' choice,
  which will display the associated configuration variable.
! <enter>, <return>, and <keypadenter> can be bound to separate
  functions/macros.
+ $sort_thread_groups can be used to sort top-level thread groups differently
  than subthreads.
! contrib/smime.rc now uses the cms utility for SMIME encryption/decryption.
+ $compose_confirm_detach_first helps prevent accidentally deleting your
  typed message in the compose menu.
+ The $attach_save_charset_convert quadoption prompts to allow charset
  conversion of received text-type attachments when saving them to disk.
+ --with-gsasl allows configuration with the GNU SASL library, as an
  alternative to Cyrus.
! $reply_regexp is now localizable by translators, to add other
  non-standard prefixes used in the locale.  "aw" was removed from the
  default value.
! $rfc2047_parameters is enabled by default.