[Fortran-dev][Patch] Add "rank" field and use it

[Tobias Burnus]

Tobias Burnus wrote:
> This patch adds a "rank" field to the descriptor and uses it. Before 
> the information was in the dtype. At the same time, it bumps the 
> maximal rank from 7 to 15 as required by Fortran 2008.

I have now committed the patch as Rev. 197323 to Fortran-dev - and 
updated it to the trunk version (Rev. 197332).

Tobias