Revision 1229

Use a list instead of seperate variables for
        extension parameters so we can create a generic function
        that runs an appropriate *-config script.
(run_cs_script): Renamed from run_wx_script and modified
        to accept a second argument which is a list of lists to
        be filled in by the values returned from running the command.
(thuban_build_ext): New. Extends the build_ext command and
        provides the options --with-gdal/--without-gdal which then
        optionally includes the gdalwarp extension.