Whitelist configuration options (user preferences) that can be changed using save-pref command

Conflicts:

	program/lib/Roundcube/rcube_plugin.php
	program/lib/Roundcube/rcube_plugin_api.php
Sanity check the file path for generic message footer before adding it
Bump version for 0.8.6 release
apply IPAX fixes
add cleanup.sh script
merge
add ipax config files
use classic as ipax default (for now)
forbid access to cleanup.sh
update https rewrite rule
merge
add rewrite rule regarding internal test installation
increase max post/filesize limits