[Fortran-dev][Patch, committed] Add version field, rename "size" to "elem_len"

[Tobias Burnus]

I have committed (Rev.197282) the attached patch as obvious to the 
Fortran-dev branch.

It add the "int version" field to the array constructor and moved "size" 
up, renaming it to "elem_len" and changing its type to size_t (which is 
effectively the same). This brings the array descriptor a bit closer to 
the one of TS29113.

Additionally, the patch now sets version to 1 in some (few) cases, e.g. 
allocatables with SAVE attribute.

Tobias

PS: The next step is to fix a bunch of test-suite failures; some old, 
some due to the merge. The next bigger step is to remove "offset", to 
split the dtype - and set version, elem_len, rank and type fields.
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