Using complex from C code

[Mathieu Taillefumier]

I still have to check the example code which does compile with. I have
some suggestions for this modifications.

- Since I don't really know python, I made a very bad modification on
the language.py file. I put in comment two lines. However I think that
it is better to still have the c++ version as default language at this
time since I don't have enough feedback for C version. So the best is
I think that c++ is the default language for complex but have an
option to activate C version for complex numbers. I should also indicate
that the we need to have a C99 compliant compiler gcc 3.4 and after
work well but they are still not very optimized. Intel compiler works
also, but I don't know about the other. So use the option with care. The
modifications should not break anything. 
- As I said before. I still have to look at the example code with do
not compile when Complex are activated. It is just question of time.

Regards

Mathieu
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Dr Mathieu Taillefumier
Max Planck Institute for Microstructure physics
Weinberg 2,
D-06120 Halle (Saale) 
Germany

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