** enable to define folder icons in elmo.el
** reconsider the structure of msgdb and make behavior faster
** enable to define folder icons in elmo.el
** reconsider the structure of msgdb and make behavior faster
** organize optional setting for pipe folders to download messages at once
when one checks new messages
** support for rfc2192, rfc2193, rfc2221 (managing imap referral)
** organize optional setting for pipe folders to download messages at once
when one checks new messages
** support for rfc2192, rfc2193, rfc2221 (managing imap referral)