GitLab

Set it to the last time the directory had a commit

Intended to be called from the Makefile; make is annoyingly bad at
this.

Don't want to accidentally push a grading branch and update a submit
branch

If we try to grade a student who didn't submit anything, create an
orphan branch for grading.

Should probably check to make sure the student username is valid, to
avoid triggering this behavior if you typo a username

For now, nothing I'm building uses bibtex or \refs

No sense in burying it in the planning directory