Handle figure paperpositionmode "auto" (bug #37554) * graphics.cc (figure::properties::get_auto_paperposition): new method to compute paperposition from on screen figure position * graphics.cc (figure::properties::set_position, figure::properties::update_papertype, update_papersize, update_paperorientation): use new method to update paperposition when mode is "auto" * graphics.cc: add %!test for bug #37554 * graphics.in.h (figure::properties): let paperposition update paperpositionmode * graphics.in.h (figure::properties::update_paperpositionmode): use new method to update paperposition when mode is "auto"

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