GFortran documentation updates merged into 4.2.

[Brooks Moses]

I just merged all of my recent GFortran documentation changes and 
updates into the 4.2 branch.  Rather than attach the quite large diff 
between the pre- and post-commit versions, I'm attaching the much 
smaller diff between the current 4.2 and Mainline versions of the 
documentation files.  This should cover all of the documented 
differences between the two branches -- at present, this is a handful of 
F2003 features, and four new compiler options.

The merged files were tested with "make pdf" and "make info" on 
i686-pc-linux-gnu, and committed under blanket approval from Steve Kargl.

- Brooks
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