Don't use borders on background colors; fix error with recent changes to linebreaking (spacelimit was in em's but should be in em's*1000)

Author: dpvc

config/TeX-AMS-MML_SVG-full.js

@@ -414,7 +414,7 @@ MathJax.Hub.Register.StartupHook("SVG Jax Ready",function () {
       //    use it to modify the default penalty
       //
       var linebreak = PENALTY[values.linebreak||MML.LINEBREAK.AUTO];
-      if (values.linebreak === MML.LINEBREAK.AUTO && w >= PENALTY.spacelimit)
+      if (values.linebreak === MML.LINEBREAK.AUTO && w >= PENALTY.spacelimit*1000)
         {linebreak = [(w+PENALTY.spaceoffset)*PENALTY.spacefactor]}
       if (!(linebreak instanceof Array)) {
         //  for breaks past the width, don't modify penalty

jax/output/SVG/autoload/multiline.js

@@ -1093,7 +1093,7 @@
             var g = SVG.Element("g"); g.appendChild(svg.element);
             svg.element = g; svg.removable = true;
           }
-          svg.Add(BBOX.RECT(svg.h,svg.d,svg.w,{fill:values.background}),0,0,false,true);
+          svg.Add(BBOX.RECT(svg.h,svg.d,svg.w,{fill:values.background,stroke:"none"}),0,0,false,true)
         }
         //
         //  Add borders