[Patch,Fortran] Increase maximal array rank from 7 to 15 for Fortran 2008

[Paul Richard Thomas]

>  The following patch allows arrays with a maximal rank (= "normal" rank + coarray rank)
>  of 15 as required in the candidate draft of the Fortran 2008 standard.
>
>  Build and check-gfortran'ed on x86-64.
>  OK for the trunk?

Yes, indeed, this is OK:)

Thanks

Paul