Methods and Primitives are now identified by is_invokable()

Using a mixing as introduced in b159370a39770edc493bb8d19200a6dd4007eb0f is not sufficient.
We want to be able to know whether an object is Method/Primitive and using the type test as with multiple inheritance does not work anymore.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Should parse integers with int()

Hope to make sure that they are int instances that way

Signed-off-by: Stefan Marr <git@stefan-marr.de>
RPython doesn't like integer indexed dicts, replaced by plain tuples

I guess that was the problem, but I also changed the sentinel object into a magic int

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fix initialization for wrapped field of BigInteger and Double

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed import of std_print

- not a classmethod anymore

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Frame initialization

- think those are integers...

Signed-off-by: Stefan Marr <git@stefan-marr.de>