[Patch,Fortran] Update gfortran.texi for mixed-language programming

[Tobias Burnus]

Tobias Burnus wrote:
> I did some clean up of gfortran.texi in the introduction,
> [and added a] chapter on mixed-language programming.
>   
Thanks to Dominique, Ralf and Craig for the suggestions. I attached is the updated patch.

> Maybe use @deffn here somewhere?

I think it does not fit in the way functions/subroutines are represented
in the gfortran manual.

> I would move 'by default' to after 'call-by-value'.  My instincts are
> opposed to calling Fortran's default 'call-by-reference' (probably
> because of numerous corrections in clf to anyone who calls the Fortran
> default that), but I can't think of a short way to state it more
> accurately. 
I tried several versions and didn't not come up with something concise,
clear, and correct; thus I still use 'call-by-reference' which is kind
of correct (the address is passed, not necessarily of the actual
argument itself but maybe of a copied object or a temporary variable
[for expressions]).

I hope I have not missed anything.

Build on x86-64-linux. OK for the trunk?


Tobias
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