Improvements for bitwise, logical and comparison operators

[mheinzel]

1 ^ 2 ^ 3 works now.
Logical operators (or, and) only evaluate the second argument if necessary (short-circuiting). This also works with truthiness.

You can see examples for these things in the tests I added.

I am currently working on comparisons, there is a lot missing (e.g. comparison of bools, lists, strings, equality of sets and lists). I think it would be best to base it on the methods __eq__() etc., but that would require some work.
Also, chained comparison is not supported yet (e.g. 1 < 2 < 3 > 0). I am thinking about it, but it's not really straight-forward to implement.

Generators, list/generator/tuple comprehensions, and splat/star-args are waiting as well, so there is enough to do :D

Matthias

[mheinzel]

I implemented equality and comparison for many different types. There is some duplication between equal and compareObjs, but that is hard to avoid (one reason are cyclic dependencies). Maybe I will base it on __eq__() etc. one day.

And I got chained comparison operators down! Such a good feeling. 😄
1 < 2 < 3 means 1 < 2 and 2 < 3, but you cannot evaluate the part in the middle twice. If there is a function with side-effects, it will change the meaning of the program.

[mattgreen]

Sorry for the delay, I've been on vacation and am still getting back into real life. :)

Great work on all of these! I need to study some of the commits some more.

[mheinzel]

No problem, just take your time! If there is anything unclear or you are not happy with something, don't hesitate to ask me about it.