Content Update

About page descriptions changed to reflect current state of development.

Image added to serve as a placeholder for unavailable features.
Registration System

Error output typo corrected.
Student invitation-related content changed to "invitations" rather than
"additions". Invites are still instructor-specific.
Class Student Table, Course Tags Table

The class student table was modified to be sorted by descending role and
by ascending name, and the instructor was removed from the listing. The
course tags table was modified to be sorted by ascending tag name.
Question Submission Bug Fix

Fixed a bug where if creating a new question after editing a question,
the newly submitted question would replace the previously edited
question.
Class Regulation and Termination, Pre-registration

Feature allowing instructors to terminate their classes implemented.
Interfaces for students and instructors modified to accommodate this
possibility. Privileges/access to pages were also modified to prohibit
access specific to classes not in session, including when taking exams.
As a side effect, the results interface was updated slightly to adjust
correctness indicator positioning, bolding of the "Explanation" header,
and spacing between question results.

A "disabled" class was added to the index CSS to represent disabled
classes.

In-session classes now appear first on the instructor page.

New classes can now add students that are already registered with eXam
Center by selecting them from a dropdown list, such that students do not
have to make new accounts to access a different section of a course.

Core set of files created, core-student including a Student class used
to sort by role then name.