* This patch allows to specify different margins for odd and even
pages by setting two-sided to true in the \paper block
* The corresponding settings are inner- and outer-margin, there
exists the possibility to set a binding-offset, too
* These values are stored internally as left- and right-margin,
though. Translation is done in page.scm:make-page-stencil
* Small code cleanup in paper.scm:set-paper-dimensions