Some MathML3 attributes for the Sanitizer (to match itex2MML 1.4.7)
Some MathML3 attributes for the Sanitizer (to match itex2MML 1.4.7)

git-svn-id: 829f041edcabe93b7893c4ec42f5993156d1fcf0@2039 eee81c28-f429-11dd-99c0-75d572ba1ddd

santiagoaguiar/svg-edit,santiagoaguiar/svg-edit,johan/svg-edit,santiagoaguiar/svg-edit,johan/svg-edit,santiagoaguiar/svg-edit,johan/svg-edit