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pcbnew: "Postscript A4" radiobutton now restored in "Plot" dialog box (if it had been selected previously)
Also fine-tuned spaces within strings specified within share/infospgm.cpp

Changes to pcbnew/gendrill.cpp which primarily enhance Drill Report files, but which also result in Drill Map files listing the diameters of each drill in the selected drill unit first (and then in the other drill unit).