WMS GETFEATUREINFO does not work with Gaia

[jng]

If you use Gaia to do a WMS GETFEATUREINFO for any layer served via WMS, it will return back the following response:

<?xml version="1.0" encoding="UTF-8" ?>
<ServiceExceptionReport version="1.3.0" 
   xmlns="http://www.opengis.net/ogc"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.opengis.net/ogc http://schemas.opengis.net/wms/1.3.0/exceptions_1_3_0.xsd">
 <ServiceException code="MissingInfoFormat">
  The request must contain an INFO_FORMAT parameter to specify the format of feature information (MIME type).
 </ServiceException>
</ServiceExceptionReport>

This is because the GetFeatureInfo requests sent from Gaia does not contain the INFO_FORMAT parameter.

If we take Gaia's word for it (being a correct WMS client), this would imply that if an INFO_FORMAT parameter is not specified in the GetFeatureInfo request, then a default value should be provided (text/xml ?)

[jng]

Fixed r7280