Log Message:
Update roundcube to 0.9.3.

RELEASE 0.9.3
-------------
- Fix setting refresh_interval to "Never" in Preferences (#1489286)
- Optimized UI behavior for touch devices
- Fix purge action in folder manager (#1489280)
- Fix base URL resolving on attribute values with no quotes (#1489275)
- Fix wrong handling of links with '|' character (#1489276)
- Fix colorspace issue on image conversion using ImageMagick (#1489270)
- Fix XSS vulnerability when saving HTML signatures (#1489251)
- Fix XSS vulnerability when editing a message "as new" or draft (#1489251)
- Fix rewrite rule in .htaccess (#1489240)
- Fix detecting Turkish language in ISO-8859-9 encoding (#1489252)
- Fix identity-selection using Return-Path headers (#1489241)
- Fix parsing of links with ... in URL (#1489192)
- Fix compose priority selector when opening in new window (#1489257)
- Fix bug where signature wasn't changed on identity selection when editing
  a draft (#1489229)
- Fix IMAP SETMETADATA parameters quoting (#1489231)
- Fix "could not load message" error on valid empty message body (#1489228)
- Fix handling of message/rfc822 attachments on message forward and edit
  (#1489214)
- Fix parsing of square bracket characters in IMAP response strings (#1489223)
- Don't clear References and in-Reply-To when a message is "edited as new"
  (#1489216)
- Fix messages list sorting with THREAD=REFS
- Remove deprecated (in PHP 5.5) PREG /e modifier usage (#1489174)
- Fix empty messages list when register_globals is enabled (#1489157)
- Fix so valid and set date.timezone is not required by installer checks
  (#1489180)
- Canonize boolean ini_get() results (#1489189)
- Fix so install do not fail when one of DB driver checks fails but other
  drivers exist (#1489178)
- Fix so exported vCard specifies encoding in v3-compatible format (#1489183)