Mapserver: fixed inconsistencies int WMS GetFeatureInfo response

Changes:
* fixed computing of global bounding box (for all matched features) in GML format and include it in correct XML element (<gml:boundedBy>)
* transforms features geometries and bounding boxes into requested CRS (for both text/xml and GML formats)
* doesn't include feature geometry in GML format when 'Add geometry to feature response' is not set

I will prepare pull request for master in a short time