Refactored the builder: moved all identification information (i.e. properties related to IdentifiedObject)
to a new super class, to be shared by the Datum, CS and CRS builder to be provided in a future SIS version.
Renamed the remaining of DescriptorBuilder as ParameterBuilder for clarity.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1574562 13f79535-47bb-0310-9956-ffa450edef68