Added a few tests.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1543666 13f79535-47bb-0310-9956-ffa450edef68
Ported JAXB adapters for datum objects.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1543667 13f79535-47bb-0310-9956-ffa450edef68