do not check lon and lat of Coordinates supporting also metric CRS

do not check lon and lat parameters in constructor of Coordinates supporting also metric CRS (Coordinate Reference Systems):

define lon and lat like in OpenLayers (see constructor http://dev.openlayers.org/releases/OpenLayers-2.13.1/doc/apidocs/files/OpenLayers/BaseTypes/LonLat-js.html )
allowing alternative map units (kilometer, meter, mile, foot and inch) additional to degree
(idea from http://dev.openlayers.org/releases/OpenLayers-2.13.1/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.units )