Reorganized the metadata XML (un)marshalling tests in order to put them closer to the implementation classes used for the tests.
The initial intend of previous layout was to keep together the XML tests. However this appears to be confusing (the test classes
were not directly related to any SIS implementation classes) and not always practical since XML bindings with JAXB are sometime
closely related to package-privated methods. The sis-referencing module was testing XML close to the implementation classes for
this reason. This commit makes the sis-metadata module consistent with the sis-referencing module in this regard.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1550841 13f79535-47bb-0310-9956-ffa450edef68