added DST_METHOD testing for GCP_POLYNOMIAL and GCP_TPS

git-svn-id: https://svn.osgeo.org/gdal/trunk@26553 f0d54148-0727-0410-94bb-9a71ac55c965
added DST_METHOD and support for GCP and TPS dest

git-svn-id: https://svn.osgeo.org/gdal/trunk@26554 f0d54148-0727-0410-94bb-9a71ac55c965