Initial port of parameter groups, to be used as inspiration for DefaultFeature and DefaultFeatureType implementations.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1575081 13f79535-47bb-0310-9956-ffa450edef68
Fixed javadoc sentence.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1575085 13f79535-47bb-0310-9956-ffa450edef68