This is a bug-fix release primarily to address issues with WebKit that can cause the page to crash or some text to be missing in recent versions of Safari.

• Update AsciiMath to current master version
• Update mhchem to version 3.3.0
• Update a11y to version 1.5.0 (with SRE 2.2.2)
• Use Plane1 alphabets for STIX fonts when possible in HTML-CSS and SVG. (#1923)
• Improve line breaking algorithm for all output modes. (#1970)
• Fix problems with multline in CHTML (with tags) and SVG (with small containers). (#1974)
• Add CSS for munder in CHTML. (#1981)
• Adjust measuring of ex size and container width to avoid line breaks for inline math in WebKit. (#1982)
• Don't rescale mstyle bbox for scriptstyle changes in CHTML. (#1985)
• Prevent potential infinite loop in setRenderer(). (#1986)
• Make sure \big, etc., are at the right size in script styles in CHTML. (#1987)
• Fix problem with position of under/over applied to tables in SVG and HTML-CSS. (#1993)
• Properly handle MML spacing for explicit FORM attributes in all output modes. (#1997)
• Fix potential crash and missing text in recent Safari versions. (#2005)
• Change WebKit version for accent fix from 603 to 602. (#2017)
• Adjust max-width in SVG output to account for scaling factor.
• Fix for useMMLspacing and FORM attributes.
• Properly count multi-character glyphs when looking for a single character