added patches providing an overview of functionality: filter, analysis

and while doing so it ocurred to me that quite a few problems appear with those simple cases:

- ImageLoad -> Renderer (OpenCV) shows image in wrong colors (tested with earth.jpg)
- the scalar filters don't seem to operate at all
- the normal filters seem to operate once but not on changing any of their inputs
- closing the patch results in an AV

note: all tested with currently availably binary (not latest github sources)