[Rd] Memmory Bugs (PR#4474)

[eriehl at email.unc.edu]

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I found (or rather the compiler I was using found) a few bugs in the 
R-1.7.1 sources.  I'm  not sure if they're fixed in the 1.8.0 sources
or not.

I've attached a diff file, where R-1.7.1a is the patches version.

Eric Riehl

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