Log Message:
Update roundcube to 0.8.4.

A little improvement to MESSAGE about upgrading.

CHANGELOG Roundcube Webmail
===========================

- Fix XSS vulnerability in handling of text/enriched messages (#1488806)
- Fix handling of 'media' attribute on linked css (#1488789)
- Fix regression where unintentional page reload was done after request abort \ 
(#1488802)
- Fix excessive LFs at the end of composed message with top_posting=true (#1488797)
- Fix bug where leading blanks were stripped from quoted lines (#1488795)

RELEASE 0.8.3
-------------
- Fix AREA links handling (#1488792)
- Fix possible HTTP DoS on error in keep-alive requests (#1488782)
- Fix compatybility with MDB2 2.5.0b4 (#1488779)
- Fix a bug where saving a message in INBOX wasn't possible
- Fix HTML part detection in messages with attachments (#1488769)
- Fix bug where wrong words were highlighted on spell-before-send check
- Fix scrolling quirk in email preview frame using Opera 12 (#1488763)
- Fix displaying of multipart/alternative messages with empty parts (#1488750)
- Fix Warning: htmlspecialchars(): charset `RCMAIL_CHARSET' not supported \ 
warning in Installer (#1488744)
- Fix threaded list sorting on PHP < 5.2.9 (#1488748)

RELEASE 0.8.2
-------------
- Fix XSS vulnerability from HTTP User-Agent header (#1488737)
- Force fonts in compose fields to be all the same (#1488690)
- Add full headers view in message preview window (#1488538)
- Fix message display page issues (#1488590, #1488642)
- Fix handling vCard entries with TEL;TYPE=CELL (#1488728)
- Fix error where session wasn't updated after folder rename/delete (#1488692)
- Fix PLAIN authentication for some IMAP servers (#1488674)
- Fix encoding vCard file when contains PHOTO;ENCODING=b (#1488683)
- Fix focus issue in IE when selecting message row (#1488620)
- Fix displaying all headers when they contain malformed characters (#1488666)
- Fix decoding of HTML messages with UTF-16 charset specified (#1488654)
- Fix quota capability detection so it can be overwritten by a plugin (#1488655)
- Fix identity selection on reply (#1488101)
- Fix Larry's messages list filter in IE (#1488632)
- Fix more IE issues by disabling Compat. mode with X-UA-Compatible meta tag \ 
(#1488626)
- Fix setting locales under Solaris - use additional .UTF-8 suffix (#1488628)
- Fix email address validation for addresses with IP address in domain part
- Fix Larry skin issues in IE7 compat. mode (#1488618)
- Fix so subscribed non-existing/non-accessible shared folder can be unsubscribed