Added "exitted lesson" screen and I18N'd the text of the welcome screen. Made the Action more robust with respect to exceptions - most exceptions are now caught and a proper error message is sent back to Flash (rather than nothing being returned). Changed the LearnerActions to not forward to page when the wddx packet is returned. We now have a Flash interface so forwarding to a page (rather than letting Flash bring up the next bad) is now bad. Had to change the dummy learner screen to still forward temporarily otherwise the dummy screen won't display the tool pages.
Changed finished/attempted activity sets to non-lazy, so that when the DisplayAction screen tries to generate the list of ids it doesn't throw a "lazy loading exception". The exception occurs as it is using a LearnerProgress object stored in the session in a previous call. Note: this is needed to update the progress bar in Flash.
