[Patch, Fortran] Allocatable coarrays: Pass "token" to caf_registering

[Tobias Burnus]

Simple patch: Coarrays are identified by a token; this patch passes the 
token (which is stored in the descriptor allocatable coarrays) to 
libcaf's registering function.

In terms of token and allocatable coarrays: The next step is to fix 
passing actual arguments to assumed-shape coarrays dummies. (Explicit 
shape and deferred shape is OK.) And handling the explicit and automatic 
deallocation of allocatable coarrays.

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

Tobias
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