Enable the ProjectSurvey and GradingProjectSurvey views in the core. Also add menu items to the program menu for easy access to these options. Reviewed by: Lennard de Rijk

Implemented taking ProjectSurveys. The user will first be served a list of all eligble StudentProjects for which the ProjectSurvey can be taken. After clicking on the list the key_name of the project is attached as a GET param and the code uses the normal take view with the hooks to let everything run smoothly. An extra access check method is required which checks if the Project mentioned in the GET param is a valid project for the current user. This check will run together with the isSurveyTakable checker.