Wed Apr 29 18:29:37 CEST 2009

Abstracting parsing words.

Let's try to abstract parsing words in units too.  Since they are
always written in terms of scat words (which are values), units _can_
be used.

However, it does seem there is no way to then get at this syntax by
requiring a module..  Only by importing the signature.

That seems to answer the question:

   * forth files are units, because they need _syntax_ which depends
     on functionality provided by other units.

   * all parsing words are part of signatures if they depend on
     external functionality.

So, I'm confident I can find some way to organize all code, so let's
start with where I left off wrt. the operator signatures, and work up
from there.