Refs #513, fixes "daily" frequency for recurring events.

It now takes into account the day immediately following the event start date.
Added the ability to copy assessments from one cohort/class list to another (or the same one, where they are simply appended to the end of the list).
Merge branch 'develop' of https://github.com/EntradaProject/entrada-1x into develop

# By Robert Fotino (1) and Ryan Warner (1)
# Via Robert Fotino
* 'develop' of https://github.com/EntradaProject/entrada-1x:
  Refs #513, fixes "daily" frequency for recurring events.
  Updates LDAP sync script to no longer create cohorts, and adds handling for when a cohort doesn't exist.
Fixed an issue in which the "other teacher" textboxes weren't being shown when evaluating the "other teacher" selection on preceptor (clerkship) evaluations.
Ref #516, updates the variable used to recur the Required Prep field.
Added the group (cohort or course list) id to the export CSV functionality as linked on the assessment grading page to ensure that the export works properly.
Fix for subscriptions to calendars for non-students. Previously the api would try to use course-specific filtering no matter what when non-students would subscribe to a calendar, so I've changed that to now pull the old/default filters if no specific course id is provided.
Changed the name format outputted on the course content admin page, so that all of the course contacts names show up in the same format (first space last, rather than last comma first).
Merge branch 'develop' of https://github.com/EntradaProject/entrada-1x into feature/course-materials