You may now request the value of a single modopts.ini key value (optionally
specifying a default option value), via:
    optval = load({}, 'modopts.js', 'modname', 'optname');
or:
    optval = load({}, 'modopts.js', 'modname', 'optname', default_optval);

This usage will return just a single option value rather than an object
containing properties reflecting all the options in the [modname] section.
The pre-existing usage is still supported (and preferred in most cases).