Added a settings page to student_search module, moved settings specific to its functioning
to there.

Made it so that the user's permissions are re-calculated on every page load, so if the admin
grants or takes away permissions/roles from a user, they do not have to log out and back in before
changes are affected.

Added a new form element type, "checkbox" which saves as either NULL or boolean TRUE, depending
on if the checkbox was checked. Before this, you had to specify multiple "checkboxes" in an
array structure, and it was as convenient for a single on/off checkbox.