ISIS-406: reapplying fixes in the prepare/isis-1.2.0-RC1 branch...

... prior to going round again.
* missing licenses in Wicket src files
* fixing Wicket rendering on firefox
* workaround for MRRESOURCES-58
ISIS-406: adding integration tests to the todo example app.
ISIS-406: more on integration tests and wrapper.
ISIS-406: getting integration tests to run with wrapper
ISIS-406: getting integration tests to run with wrapper

* also small enhancement to allow wrapped objects to be unwrapped