[Patch,Fortran,committed] Update download address of coco

[Tobias Burnus]

  Committed as obvious. The address change was announced at 
http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/408b5807538f0e6b 
though the old address is currently still valid.

[Background: COCO (or conditional compilation) is a preprocessor 
similarly to CPP, which has been defined as Part 3 of the Fortran 
standard (ISO/IEC 1539-3:1999). Despite being an ISO standard, no (?) 
compiler vendor has implemented a preprocessor and COCO is widely 
unknown and almost no one uses it - thus, it might be withdrawn in the 
future. Dan has written a COCO preprocessor (in Fortran), which is 
freely available.]

Tobias

PS: Another not so much used standard is Part 2, which defines varying 
length character strings; there exist implementations (written in 
Fortran) for it, it has some limited usage, but also is threatened to be 
withdrawn.
For Part 1 there is no official replacement, but CPP ("FPP") is widely 
used; for Part 2, Fortran 2003 provides allocatable character lengths 
(deferred type parameter) and (re)allocate on assignment which is a more 
natural replacement.
Let's see what Fortran 2013 will provide - maybe some template/macro 
programming, which partially replaces CPP?
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