Mapstraction - Feb 2009 - Patch to handle MapQuest icon size and icon anchor parameters

This is a patch we had to implement to use custom icons in mapquest.  We 
needed to use a custom icon size and offset, so I added a small bit of 
code to handle this.  We use MapQuest API v5.3.  That may make this not 
work in all cases, I know the icon stuff changed somewhat between 5.2&5.3. 

To make work on MapQuests 5.2 API, I *think* would only take the 
following conversions.
1) MapIcon -> Icon
2) mqmarker.setValue(''iconOffset'', new MQA.Point(x,y)); -> 
icon.setAnchorOffset(new MQA.Point(x,y));
based on 
http://developer.mapquest.com/content/documentation/ApiDocumentation/53/JavaScript/JS_DeveloperGuide_v5.3.0.1.htm#styler-id1.6.5

Since I am only able to test using the 5.3, I am going to post the diff 
to make that work.  svn diff is attached.

Thanks,
  Brandon Opfermann
  Entertainment Publications


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