ISIS-335, ISIS-342: length to abbreviate title to now configurable

* using "isis.viewer.wicket.maxTitleLengthInTables" config property
* this can go in isis.properties, or (as of ISIS-342 fix) can live in "viewer_wicket.properties",
  (assuming have added appropriate "isis.viewers" context param in web.xml)
ISIS-327: changing order of publication, changing config param

* publish action, then objects (cause and effect)
* config param now has prefix "isis.viewer.restfulobjects...."
* building on ISIS-342, this config moved to "viewer_restfulobjects.properties" in the example app.
ISIS-314: use iconName() of object if available
ISIS-335: fixing maxTitleLength setting in example app properties file

* accidentally left set to 3 instead of 12.