added UI for SOCKS settings.
added SOCKS4/5 proxy support.
added new account option 'Put signature before quote (not recommended)'.
implemented the automatic filtering of IMAP4 INBOX folder.
added the option to input signature directly.
implemented clearing of IMAP4 message caches on exit.
added an option to update only INBOX on checking new messages of IMAP4 accounts.
enabled custom queue folder.
changed the license of LibSylph from GPL to LGPL.
save GPG settings even if GPGME is disabled.
moved more modules to libsylph.
separated UI code from prefs_common.c and prefs_account.c.
moved the option of max news articles to account prefs.
added an option to encrypt when replying to encrypted message.
added PGP Sign/Encrypt check button on the compose window.
Initial import of Sylpheed (GTK2 version).