[SAGA-RG] Suggested errata to the SD spec

Hi, We would like to get rid of the URL passed into the discoverer constructor. Its comment is: "the url specified as in input parameter is to assist the implementation to locate the underlying information system such that it can be queried" The problem we have is that this does not work with an adapter based implementation as the URL is normally specific to the adapter. This information can be passed to the adapter using a configuration file or an environment variable according to the style adpopted by the adaper writer. The constructor then just has the session handle The other change is to make the attribute names consistent with the rest of SAGA - i.e. CamelCased Steve