Author: Ferran Recio
MDL-67613 availability_completion: add previous activity condition
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c54b183c8d74bfa9229b79e1d1f1dd0fa634c0d4
http://github.com/moodle/moodle/commit/c54b183c8d74bfa9229b79e1d1f1dd0fa634c0d4
+ 3.9 en [cachedef_previous_cache,availability_completion]
+ 3.9 en [option_previous,availability_completion]
+ 3.9 en [requires_previous_incomplete,availability_completion]
+ 3.9 en [requires_previous_complete,availability_completion]
+ 3.9 en [requires_previous_complete_pass,availability_completion]
+ 3.9 en [requires_previous_complete_fail,availability_completion]
+ 3.9 en [requires_previous_not_complete_pass,availability_completion]
+ 3.9 en [requires_previous_not_complete_fail,availability_completion]