Add PDF configuration data

pdftexconfig.dat

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+% Shared configuration for pdfTeX/LuaTeX low-level settings
+% All of these settings are named based on the pdfTeX 1.40
+% primitives
+
+% Paper size: dimensions given in absolute terms
+pageheight       = 210 true mm
+pagewidth        = 210 true mm
+
+% Enable PDF 1.5 output and thus more compression (enabled since TeX Live 2010)
+minorversion     = 5
+objcompresslevel = 2
+
+% Low-level settings unlikely every to need to change
+compresslevel    = 9
+decimaldigits    = 3
+pkresolution     = 600
+horigin          = 1 true in
+vorigin          = 1 true in