ISIS-293: updating quickstart_wrj archetype

- to combine wicket and restfulobjects viewers into single webapp
- also provide a welcome page to help get started
ISIS-293, ISIS-294: removing defunct quickstart archetype...

.. and adding quickstart_wicke_restful_jdo to root pom.xml (now that 1.0.0 has been released)
ISIS-293: fixing DataNucleus dependency in pom.xml

... for some reason (that I don't quite understand), would now seem that don't need the asm exclusion for the DN enhancer dependency anymore