This just deletes all the upgrade steps previous to 2.7.0. Some
small adjustments, like adding missing MOODLE_INTERNAL or tweaking
globals can also be applied when needed.
Next commit will get rid of/deprecate all the upgradelib functions
not used anymore in codebase.
JAWS Maths player does not recognise the math content when manually specifying the config for MathJax.
If you use one of the default config files it works.
So - we switch our config to the Accessible.js config that it is based off anyway.
There are no features changes with this approach.
Conflicts:
filter/mathjaxloader/version.php
Dan Poltawski