par(new=T) works differently in pdf vs postscript if applied before a plot statement. (PR#4037)

If I place par(new=T) before I create a plot in a script that is sent to a pdf 
device, the pdf is unopenable and reports itself as having no pages.  The 
postscript device seems to ignore the par instruction.

I guess one of these is a bug, but I don't know which one!

--please do not edit the information below--

Version:
 platform = i386-pc-linux-gnu
 arch = i386
 os = linux-gnu
 system = i386, linux-gnu
 status = 
 major = 1
 minor = 7.1
 year = 2003
 month = 06
 day = 16
 language = R

Search Path:
 .GlobalEnv, package:grid, package:lattice, package:tools, package:methods, 
package:ctest, package:mva, package:modreg, package:nls, package:ts, 
Autoloads, package:base

Andrew Robinson                      Ph: 208 885 7115
Department of Forest Resources       Fa: 208 885 6226
University of Idaho                  E : andrewr@uidaho.edu
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Moscow ID 83843                      Or: http://www.biometrics.uidaho.edu
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