_withParam

Adds the specified query parameter to a Link or URL -- Function
LINK or URL -> _withParam(PARAMNAME, VALUE, RAW) -> URL
By and large, the VALUE is translated in such a way that, if the LINK points to a Querki page, the page can use that parameter as $PARAMNAME in QL expressions.
The RAW parameter is optional, and defaults to false. If you set it to true, this will omit quotes around the parameter if it is text. You should generally only do this if this is going to an external page; omitting the quotes when sending to a Querki page will usually result in the parameter not getting interpreted correctly.