[wwwdocs] Update Fortran secrion in 4.8/changes.html

[Tobias Burnus]

Attached is the first 4.8 merge of the Fortran related changes from 
wiki/Gfortran#news into the 4.8 release notes.

I have committed the patch as obvious, however, I am happy for any comments.

Possibly easier to read: http://gcc.gnu.org/gcc-4.8/changes.html (all in 
the "Fortran" section)

Tobias

PS: Still to do: Update the manual's status section and interop section 
for TYPE(*)/DIMENSION(..).
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