If Param Tags
Adds 3 new Radius tags intended to make small hacks a bit easier;
<r:if/unless param />
Expands only if the param specified in 'name' is present. If the additional 'matches' attribute is given, the param must match that to expand.
<r:if_param name="foo" [matches="on"]>Foo: <r:param name="foo" /></r:if_param>
<r:param />
Renders the param if found.
<r:param name="foo" />