Squashed 'lectures/' changes from 03790f4..957077e ...

957077e Normalised package info messages
92ddc46 Complete rewrite for LuaTeX

git-subtree-dir: lectures
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Squashed 'lectures/' changes from 7f06e86..bbda7a2 ...

bbda7a2 Switched to new Otago branding

git-subtree-dir: lectures
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Squashed 'lectures/' changes from 8968d42..7306843 ...

7306843 Merged in changes that were inadvertently made in a subtree clone.
ed89997 Added \alertbf and Mark George’s text highlighting macros.

git-subtree-dir: lectures
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Squashed 'lectures/' content from commit 2b1085b ...

git-subtree-dir: lectures
git-subtree-split: 2b1085b