[Patch, Fortran] Allocate + CAF library

[Daniel Carrera]

Hello,

This is my largest patch so far and the first that I'll commit myself. 
This patch improves support for the ALLOCATE statement when using the 
coarray library. Specifically, it adds support for the stat= and errmsg= 
attributes:

ALLOCATE( x(n)[*] , stat=i , errmsg=str )

These attributes are now written by the CAF library. This patch also 
involves a good amount of code cleanup.

ChangeLog is attached.

As soon as I get the go-ahead, I'll commit this patch.


Cheers,
Daniel.
-- 
I'm not overweight, I'm undertall.
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