Switch from main to fork:
git submodule set-url -- psychtoolbox-3 https://github.com/aforren1/psychtoolbox-3
git submodule set-branch --branch <branch> psychtoolbox-3
git submodule sync
?cd psychtoolbox-3
, pull & make sure right branch/commit available?
Fork to main:
git submodule set-branch --branch master psychtoolbox-3
git submodule set-url -- psychtoolbox-3 https://github.com/kleinerm/psychtoolbox-3
git submodule sync
?- Check out master, pull latest?