This patch:
  - removes unused 'org-remember-handler' from
  'remember-handler-functions'
  - adds a new option 'remember-item-format-function' to be used with
  'remember-append-to-file'. This allows the user to specifify a custom
  function to format a remember item. The current format uses a
  hardcoded format that consists of 'remember-leader-text' +
  'remember-time-format' + short description for the header and the
  'buffer-string' for the body
  - adds a new option 'remember-diary-regexp' to extract the hardcoded
  and undocumented regexp used on 'remember-diary-extract-entries'
  - adds logic to automatically save the diary buffer on
  'remember-diary-extract-entries' respecting the value of
  'remember-save-after-remembering'