Update roundcube package to 0.7.2.

- Fix handling of % character in IMAP protocol (#1488382)
- Fix duplicate names handling in addressbook searches (#1488375)
- Fix displaying of HTML messages from Disqus (#1488372)
- Disable E_STRICT warnings on PHP 5.4
- Prevent from folder selection on virtual folder collapsing (#1488346)
- Fix automatic unsubscribe of non-existent folders
- Fix double-quotes handling in recipient names
- User configurable setting how to display contact names in list
- Make contacts list sorting configurable for the admin/user
- Fix parse errors in DDL files for MS SQL Server
- Revert SORT=DISPLAY support, removed by mistake (#1488327)
- Add lost translation label in de_DE (#1488315)
- Fix drafts update issues when edited from preview pane (#1488314)
- Fix wrong variable name in rcube_ldap.php (#1488302)
- Make mime type detection based on filename extension to be case-insensitive
- Fix failure on MySQL database upgrade from 0.7 - text column can't have default value (#1488300)

(taca)