Add support for EPSG url as proposed in last OGC's standards

[dgrichard]

OGC's standards propose to reference CRS using this kind of url for EPSG register :

http://www.opengis.net/def/crs/EPSG/0/CODE

This patch proposes to support urls like :

http://*/def/crs/AUTORITY/VERSION/CODE

although VERSION is not being used for the moment

[dgrichard]

patch to support  http://*/def/crs/A/V/Code

[madair]

fixed in [2223]

[madair]

patch was incorrectly applied before, now in changeset [2224]