see #9341 - provide utility methods to open URL + decompress stream if needed



git-svn-id: http://josm.openstreetmap.de/svn/trunk@6421 0c6e7542-c601-0410-84e7-c038aed88b3b
see #9331 - allow custom formatters in SystemOfMeasurement methods



git-svn-id: http://josm.openstreetmap.de/svn/trunk@6422 0c6e7542-c601-0410-84e7-c038aed88b3b