reg: Implement basic 'reg add'.

[Andrew Riedi]

The last version of this patch was from March.  I went back and reread
AJ's mail to me.  I believe I have everything corrected now.  Also,
since Wine 1.0 is out, I figure it is time to send the updated version
of this patch.

changelog: reg: Implement basic 'reg add'.

-- 
Andrew Riedi
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