WIP: Docunits
Changes:
- Partial rewrite of the code taken from extensions-svgunitfactor
(get_document_scale() used in overloaded unittouu() and uutounit() methods to convert lengths based on the document's actual scale instead of a match to one of the known unit factors). - Update of set_dpi() to only overload the unit conversion table for files without viewBox (or on request).
Todo:
- Decide strategy on supporting relative units in SVG width, height (%, em, ex).