also backported:
- r40748: loading all translations in one go from cachem, saving some latency
- r36329: config is now cached on instance level, arrays in $GLOBALS[egw_info][server] are now automatically serialized and unserialized
- the backup is independent of the used DB and can eg. be used to port an install to an other DB type
- autom. backup before upgrades of the DB structure
- installing backups instead an installation from scratch
- own backup screen in setup and admin to:
+ shedule repeating backups
+ up- and download of backups
+ creating and restoring backups
- move most of the lang-code from setup/lang.php to phpgwapi/inc/class.translation_sql.inc.php
- added a minimal-auto-configuration, so one does not need to enter the config-step at all for a running installation
- added the language of the admin to the installed languages