Added debug output to ground to image error message. (#168)

   // If the final correction is greater than 10 meters,

   // the solution is not valid enough to report even with a warning

   if (len > 100.0) {

      std::ostringstream msg;

      msg << "Did not converge. Ground point: (" << ground_pt.x << ", "

          << ground_pt.y << ", " << ground_pt.z << ") Computed image point: ("

          << calculatedPixel.line << ", " << calculatedPixel.samp

          << ") Computed ground point: (" << calculatedPoint.x << ", "

          << calculatedPoint.y << ", " << calculatedPoint.z << ")";

      throw csm::Error(

         csm::Error::ALGORITHM,

         "Did not converge.",

         msg.str(),

         "UsgsAstroLsSensorModel::groundToImage");

   }