Insert external link to the Google Maps web site.
The following parameters are recognized:
Only required if you want to override the default text the user sees in the web page.
Allows one to override the default "tooltip" and "target" attributes. You may also specify any other <a> attributes you want here (other than "href" and "class").
This macro is defined as:
@appExtRef("Google Maps","http://maps.google.com/","@param(0)","@param(1)")