tightening mathjax tex options

[Patrice Dumas]

Hello,

I propose to set the following in mathjax defaults, to avoid possible
interactions with text (although it may not be possible anyway because
of ignoreHtmlClass set in body), and perhaps simplifying the task of mathjax:

  tex: {
    processEscapes: false,      // use \$ to produce a literal dollar sign
    processEnvironments: false, // process \begin{xxx}...\end{xxx} outside math 
mode
    processRefs: false,         // process \ref{...} outside of math mode
    displayMath: [             // start/end delimiter pairs for display math
      ['\\[', '\\]']
    ],
  }

Any comment?

-- 
Pat