[Patch, Fortran] Fix module I/O with assumed-rank arrays

[Tobias Burnus]

Tobias Burnus wrote:
> The following issue was found by Alessandro. (It got triggered by a 
> larger test case, which is required for a larger patch by Alessandro, 
> which is not yet finished.)
>
> Accessing the "lower[-1]" is probably not the best idea …
>
> Build on x86-64-linux.
> OK for the trunk?

I attached the wrong version – the additional problem was that 
mio_integer expects nonnegative numbers.

Build and tested on x86-64-linux.
OK?

Tobias
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