set_opt

Produce a function which can get or set global options

It provides more configurations on the option values such as validation
and filtering on the values, making options invisible or private.

Zuguang Gu

<dl>
 <dt>...</dt>
<dd>all go to <code>setGlobalOptions</code></dd>
</dl>

<dl>


 <dt>...</dt>
<dd>all go to <code>setGlobalOptions</code></dd>


</dl>