- back and continue button

- started working on group finding prototyp (basic group management prototyp for development - not advanced groupfinding i.e. mirjams project)

* and removed in front end

* also a new function called 'getValueFromUrl'

It is necessary to hide the button if the comment text is to long

before:
project-student.js --> givefeedback.jsp
now:
project-student.js --> annotation-document.jsp --> givefeedback.jsp