admissions_teach.html: make hidden input fields to store "tl" and "program_base_url"
Rename admissions_teach.html -> admissions.html
Trivial: rearrange functions in admissionsdashboard.js
Implement /manage/ interface for admissions panel
Load app content individually using AJAX, instead of all at once for a class
Call .admit(), etc when editing "Decision" on the admissions panel, so
that it unadmits students from other classes
Add force-fetch of Formstack back to keep dashboard up to date
Adjust width of panes on manage admissions dashboard; fix indentation
Refactor admissionsdashboard.js, particularly make_table_row, into helper functions
Minor changes/fixes to /admissions
- Page title "Teacher Admissions Dashboard" --> "Admissions Dashboard"
- Add @needs_teacher
- Fix mistake in previous commit in /manage/
Use jQueryUI dialog instead of QuickUI dialog
Make teacher-related cells read-only from the admin interface
Replace resort_table with sort_table because less code trumps efficiency.
Add 'save' button to admissions dashboard, rather than auto-saving

Keep track of unsaved changes, and post them when 'save' is
pressed. This is more robust than auto-saving on every change.
Add refresh button to admissions dashboard; get rid of (useless and buggy) history.pushstate stuff
Minor changes to admissions dashboard

- Remove empty option in admin status options (empty admin status is
  not allowed)

- Instead of parseInt(x) || null, just use parseInt(x) which produces
  NaN
Changes to admissions dashboard update_apps

- Add sanity checking on input to prevent arbitrary updates
- Remove redundant/obsolete update_app
Replace "Decision" column with separate "Decision Action" and "Decision Status"

This allows for showing a more detailed decision status that includes
whether students have been accepted or waitlisted into other classes.
Remove unnecessary Javascript dependencies

Remove:
- Markdown (doesn't add much, other than overhead)
- QuickUI (since replaced with jQueryUI)
Admissions dashboard: allow opening apps in new window

Change the /app/<id> view from a JSON view into a plain HTML view, so
that it's viewable in a separate window.