ISIS-912: allow fixtures to be installed from command line even if using the simplericity jetty-console wrapper.
ISIS-912: fix so that --fixture com.mycompany.foo.MyFixtures works from the commandline.

nb: as the JIRA issue says, is also necessary to specify system property -D isis.persistor.datanucleus.install-fixtures=true
ISIS-809: view models now work for those mapped via JDO to views (ie non-durable persistence types)

@javax.jdo.annotations.PersistenceCapable(
        identityType = IdentityType.NONDURABLE,
        table = "InvoiceSummaryForPropertyDueDate", ... )