added docblock for ilios.learner_view.buildCollatedSessionObjectives().
replaced retrieval of competency titles with full competency records for objective getter method. renamed second function argument to reflect this change. added docblock to method header. refs #2608
renamed second argument in method  getObjectivesForCourse() to reflect its changed purpose. added docblock to method header. refs #2608
changed algorithm that links competencies to session objectives to prevent duplicated competency groupings. refs #2608