Redirect after HTTP authentication

Allow to redirect to the previous QUERY_STRING after HTTP authentication.
Make modcss.inc work with allow_url_fopen = Off

Alternatively use the PHP cURL extension
modcss.inc: Fixed CS
Fix opening compose screen in new window after saving as draft (#1489643)
Updated Changelog
Merge pull request #162 from nicolas-joubert/patch-1

Redirect after HTTP authentication
Fix dbmail driver (hints from https://github.com/roundcube/roundcubemail/pull/169)
Merge branch 'master' of github.com:roundcube/roundcubemail
Fix default mailbox sort order
Merge pull request #170 from Takika/patch-1

Fix default mailbox sort order
Merge branch 'master' of github.com:roundcube/roundcubemail
Support structured data for autocompletion results; map 'type' attribute to CSS class for autocomplete list items
Implement ArrayAccess interface for conveniently accessing rcube_result_set as array
Add method to reset a treelist widget
Define default treelist styles (i.e. indentation) globally
Fix input-button disabled state; add support for jquery UI buttons of type 'uibutton'
Re-arrange buttons in import dialog to match the rest of the appplication
Add styles for 'mainaction' dialog buttons
Avoid bubbling of clicks to treelist expand/collapse toggles
Avoid useless connection attempts if host is empty