syntax diagrams (ctd.)

[Jeff Kingston]

I've posted a new version of the syntax diagrams document I advertised
a day or two ago:

    ftp://ftp.cs.usyd.edu.au/jeff/lout/syntax.ps

I've improved it quite a lot by removing the requirement of having to
say over and over again which direction you are going in; now you only
have to say it at the start, and Lout does the rest.

For the expert, I did this by adding @CurrYUnit and @CurrZUnit symbols
to raw Lout, and commandeering the Z unit to record which direction
the diagram is going in.

Jeff