Feature/physical size
Currently, the real scale calculation done by page_calc_height_width
defines the 100% zoom level as "1 point in document" (1/72 inch) = "1 pixel". This MR implements a real scale calculation based on the monitor DPI. 100% zoom is defined as "1 point in document" = "1 point on monitor (physically)". This way, the size of the document on the screen matches the size it would have on paper.
This should fix issue 655.
Edited by Jeremie Knuesel