Author: Andrew Hancox
MDL-50666 core: Add function get_viewable_roles to set role visibility
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a63cd3e2ca8f864a832c5e050677acbf1bda1701
http://github.com/moodle/moodle/commit/a63cd3e2ca8f864a832c5e050677acbf1bda1701
+ 3.5 en [configallowview,core_admin]
+ 3.5 en [allowroletoview,core_role]
+ 3.5 en [allowview,core_role]
+ 3.5 en [eventroleallowviewupdated,core_role]
+ 3.5 en [novisibleroles,core_role]