Returns the name of the current paper type: "A4 210 x 297 mm", "A3 297 x 420 mm", "Letter 8 1/2 x 11 in", or "Legal 8 1/2 x 14 in". The default is "Letter 8 1/2 x 11 in". The paper name determines the size of the drawing area as reported by get-size (along with landscape transformations from wx:get-printer-orientation and/or the scaling factors of wx:get-printer-scaling).