read legend images, cache them in temp files, read width and height (without decoding entire image) for use in XSL
scale all legend images to maximum width with the same ratio in print stylesheets
Merge branch 'feat/resize-all-legend-images-same-ratio'
simplify border properties; remove confusing width=100%
fix xsl error when no legend; only scale legend images when (using 72 dpi) max legend width wider than legend width
Merge branch 'master' into feat/edit-more-inheritable