Replace explicit declaration of DefaultResponsibleParty by a @XmlSeeAlso annotation.
This allow less surprising behavior for applications that use Apache SIS with their own JAXBContext.
Credit: this is a proposal from Guilhem Legal.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1635190 13f79535-47bb-0310-9956-ffa450edef68