Revision of help pages for rubberbox function:

1) the example is devided into four independent examples;
2) explanatory text inserted in the figure as a title.

It is more convenient when the help window is maximized (or when you cannot see
the console).

* moved to the interaction category

Change-Id: I950fc5cd9d36f4833f8d267a6eeb3b1680ff248b
Fix some memory leaks and useless declarations

Change-Id: I45d2d0975afefd60ba1e5235b64984b29c42f318