Added the proper mimetype for XML pages for the impact analysis graph.
Added the proper mimetype for XML pages for the impact analysis graph.

git-svn-id: efba275c3291004ad656db059d43564e37a1fae9@2307 60fe80c7-c1f8-43be-bd32-c3e8feb7a3b0

dflaven/itop,dflaven/itop,dflaven/itop,dflaven/itop,dflaven/itop