Move debug warning from setup to load

Move debug warning from setup to load

Relocate the warning logged about debug mode from the misc.setup()
function to the Universe class load() method. This way, if debug
mode is enabled in configuration during a live reload event, it will
be logged. Also update the admin documentation to reflect that
enabling or disabling debug can be done with a reload, not only a
restart. Correct a minor spacing error in the configuration docs
too.