Receivers in POSTS.

Syntax: POST>receiver:relative_resource_url
Renamed resource path to vip.
Relative paths.
New names for save button.
Ilias don't have to delete the exercises.

Because we would configure the exercises resource as "none persistent", i.e.
when there are no refernces left (all addressed participants have DELETED the
exercise) the ECS would garbage collect the exercise.
Initial commit of exercise evaluation sequence diagram.
Use events queue.
Removed exid from applet parameters.
Changes in exercise create sequence diagram.

Forgot the evaluation code.
    Updated exercise evaluation sequence diagram.

    How to change the evaluation data in the web form is really a matter of taste.
    But if we have a complex Web-UI to fill in the data, it may be better to move
    the presentation logic away from the applet over to the responsebility of
    Ilias. So lets use a javascript function to store the data (%ptstarget).

    git-svn-id: https://subversion.rus.uni-stuttgart.de/repos/proposals/RUS-Proposals/ViP_2.0@11126 e2cad939-4b0d-0410-8f81-b950515e0023
Updated exercise evaluation sequence diagram.

Destroy applet not until the lecturer pressed the save button.
Updated applet params.
Some rearrangements in the text.