Add hook to notify plugins about message sending errors
Make sort_folder_list() public
Merge branch 'master' of github.com:roundcube/roundcubemail
Added CVE number to changelog entry
Fix folders sorting procedure.
Fixes the issue where after creating a folder with name 'Abc abc'
it were added before existing subfolders of folder 'Abc' and after 'Abc'.
Replace Array.indexOf() with jQuery.inArray() for older browsers (IE<9)
Fix issue where subject input might get filled with "null" string (IE8)