[dev-context] Environments for alignment commands

Hi Hans, can we add the following definitions to space-ali.mkiv \unexpanded\def\startleftaligned {\doalignline\relax \hss \bgroup} \unexpanded\def\startmidaligned {\doalignline\hss \hss \bgroup} \unexpanded\def\startrightaligned{\doalignline\hss \relax\bgroup} \unexpanded\def\startmaxaligned {\doalignline\relax \relax\bgroup} \unexpanded\def\stopleftaligned {\unskip\egroup} \unexpanded\def\stopmidaligned {\unskip\egroup} \unexpanded\def\stoprightaligned{\unskip\egroup} \unexpanded\def\stopmaxaligned {\unskip\egroup} The \unskip (would be \removeunwantedspaces better?) because otherwise the space at the end of the text appears in the output: \startmidaligned Centered? \stopmidaligned Wolfgang