Fix purge action in folder manager (#1489280)

Conflicts:

	CHANGELOG
Make thread toggles work on touch devices
Optimize list events for touch devices
Merge branch 'release-0.9' of github.com:roundcube/roundcubemail into release-0.9
Updated changelog
Fix scrolling in iframes on touch devices
Update changelog
Distinguish mobile/tablet/touch devices
Make session auth cookie name configurable
Let the framework adjust the include_path if necessary
Bump version for next release
Fix touch check when IE doesn't specify the event object
- Fix setting refresh_interval to "Never" in Preferences (#1489286)

Conflicts:

	CHANGELOG
Include last fix in 0.9.3 release
Merge branch 'release-0.9' of https://github.com/roundcube/roundcubemail into ipax-0.9