PG renderer processing flags

These are additional flags needed for processing/rendering a problem. These were generated by scraping the PG macros for existing needed flags. The default is given in parentheses

• displayMode (MathJaX)
• grader (avg_problem_grader)
• showOldAnswers (false) -- if true, return as a separate field in the output hash
• showCorrectAnswers (false) -- if true, return as a separate field in the output hash
• showHints (false) -- if true, return as a separate field in the output hash
• showSolution (false) -- if true, return as a separate field in the output hash
• useMathView (false)
• mathViewLocale ("mv_locale_us.js") -- is this a environmental variable?
• useWirisEditor (false)
• useMathQuill (false)
• show me another flags
• achievements (this seems to be independent of the renderer)
• periodicRandomization flags
• scaffolding problems flags
  • open_all_subproblems (false)
  • other flags to indicate open parts (or does the problem itself take this on)