Add _mbox argument to headers action URL
Remove IE7 hack that is not needed anymore
CS fixes
Unify use of local 'this' variable reference
Allow aborting of running search requests
Move rcube_installer class to include/rcmail_installer in order to remain accessible by the update script even if the installer directory was removed
Describe Selenium testing setup and provide a function to clear the SQL database
Set register_globals=off in .htaccess file and add note to INSTALL
Convert tabs to spaces
Fix so browser capabilities check is done really only once a session
Further refine cross-folder searching:
- Store incomplete search results in session and re-send search requests
  to the server if returned before complete (this should avoid hitting request timeouts).
- Display full folder path on mouseover in message list
- Remove pthreads implementation stuff as this wasn't really working
Reduce duplicated code
Only refresh the affected parts of a cross-folder search set after moving/deleting/flagging
Remove debug output
Fix saving of search settings in 'all folders' mode
Add utility script to remove a user record from the local database
Update Changelog
Fix missing Mail-Followup-To header in sent mail (#1489829)
Merge branch 'master' of github.com:roundcube/roundcubemail
Set task variable to 'cli' when loading rcmail instance in shell scripts