[Aleph] And boxes (was \parshape and \hangindent)

[ishamid]

>1. What should be the effects of local commands like \pardir TRT
>& \textdir TRT?

>2. What changes do LaTeX and ConTeXt need to make to fully accomodate
>bidirectionality?

Of course these two questions are not mutually exclusive; the question may 
become, Which is easier/more sensible to modify, Aleph or LaTeX/ConTeXt?

Idris