ISIS-437: tidy-up

Various:
- ServiceInitializerTest failing on different JVM
- updating javadoc links
- removing stale entries from installer-registry.properties
- adding exclusion on xml-apis, pick up version of org.w3c.dom stuff from JDK.
ISIS-270: JDO OS no longer throw exception if debug enabled
ISIS-526: now fixed, renders param details as per RO spec v1.0.

The previous (incorrect, non-compliant with the RO spec) behaviour can be
reinstated by setting

isis.viewer.restfulobjects.gsoc2013.legacyParamDetails=true

I've done this in case the GSOC viewers rely upon the old representations.