jquery after install
// First up, load jquery
if (isset($modSettings['jquery_source']) && !$do_defered)
but at install $modSettings['jquery_source'] is not set, so jquery doesn't load and everything is mostly broken...
Why $modSettings['jquery_source'] should not be set?
And wouldn't be better to just fallback to auto if "not set"?
Or if there is the possibility we don't want to load jQuery at all (I don't think it's realistic at the moment), have a "no jQuery" option?