Author: Sara Arjona
MDL-77254 backup: Backup/restore xAPI state
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1996a7cfbff7b77a4066e655288143fced4f6581
http://github.com/moodle/moodle/commit/1996a7cfbff7b77a4066e655288143fced4f6581
+ 4.2 en [configgeneralxapistate,core_backup]
+ 4.2 en [configrestorexapistate,core_backup]
+ 4.2 en [generalxapistate,core_backup]
+ 4.2 en [rootsettingxapistate,core_backup]