[dev-context] supp-mat.mkiv

Hi Hans, \let\normalsuperscript \Usuperscript \let\normalsubscript \Usubscript \let\normalstartimath \Ustartmath \let\normalstopimath \Ustopmath \let\normalstartdmath \Ustartdisplaymath -\let\normalstopdmath \Ustopmath +\let\normalstopdmath \Ustopdisplaymath \def\normalmathaligntab{&} % \let\normalmathaligntab\aligntab does to work well in a let to & (a def works ok) \let\normalsuper \Usuperscript % obsolete \let\normalsuber \Usubscript % obsolete \let\startimath \Ustartmath \let\stopimath \Ustopmath \let\startdmath \Ustartdisplaymath -\let\stopdmath \Ustopmath +\let\stopdmath \Ustopdisplaymath Wolfgang