[Cython] Refactoring Errors + test harness

[Dag Sverre Seljebotn]

>
> This is not a pointless excersize; the long-term aim for this would be 
> to make it possible to export Cython cleanly as a library rather than 
> just a command-line program, which in turn is necesarry for.
>   
...necesarry for creating small experimentation programs that only plays 
with certain parts of Cython rather than having to always do a full compile.

OK, I'll readily admit the benefits aren't *that* great. I'm easily 
convinced into dropping it too.

-- 
Dag Sverre