Various teaching-related LaTeX files, including several independent LaTeX repositories as subtrees

latest commit 2f4613e9a5 Nigel Stanger authored on 2 May
	beamerThemeOtagoPlain	Squashed 'beamerthemes/' changes from d682691..e14d33c	6 months ago
	beamerthemeOtago	Squashed 'beamerthemes/' changes from eb14121..2d36aa0	7 years ago
	beamerthemenzcs	Squashed 'beamerthemes/' content from commit eb14121	8 years ago