[NTG-context] bug fix for ppchtex

[Hans Hagen]

Hi,

Concerning the problem with mp graphics in ppchtex, change:

\def\pushMPdrawing
  {\globalpushmacro\MPdrawingdata
   \globallet\MPdrawingdata\empty}

\def\popMPdrawing
  {\globalpopmacro\MPdrawingdata}

in supp-mps.tex (recompilt ormat) or put those def's in cont-new.tex (no 
new format needed)

Hans


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