Remap ϱ,ϖ in font-data of STIX-web [was: STIX-web sans serif character issues in SVG]

Some characters (ϱϖϜϝ) are missing in SVG output but not in HTML-CSS output.

Example. http://www.w3.org/Math/testsuite/build/main/Characters/Variants/sans-serif-full.xhtml,