demos/py_simple: New python gfxprim + Qt example

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
pywrap: Unbreak Fill after it was moved to core

After GP_Fill() was moved to core from gfx the python bindings were not
fixed correctly.

Now Fill() is available both in core and in gfx.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
doc: Add two more python examples.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>