Helper methods (ie custom methods on a persistent) should not be callable via set() or get() even
if they start with set_ or get_. They are not the same as custom getters and setters for real persistent
properties.
Split it into a core exporter, and an extended one that adds information about the plan.
Also
* Remove userid from grade_competency_in_plan function (redundant)
* Improve the signature of list_evidence so it can handle completed plans (later)
* Rename read_user_competency_summary to data_for_user_competency_summary_in_plan
* Handle completed plans (list user_competency_plan as well as user_competency)
* Remove user_can_see_details_cap handling - if you can see the users plan you can see the user
* Pass final scaleconfiguration in the competency_summary_exporter
* Add docs comments to new templates
* Unit tests for base exporter
* Use the course_summary_exporter for list_courses_using_competency
* Rename competency_with_linked_courses_exporter to competency_summary_exporter
* Split properties_definition in 2 (added read_properties_definition)
* Improve phpdocs
* Make some methods final
* Throw an error when other_properties overlap with properties
Damyon Wiese