[logon] (somewhat fundamental) updates in the LOGON tree

[Stephan Oepen]

> I also just encountered this behavior with the ERG after upgrading to
> the new LKB - all non-string predicates announce themselves as
> unknown when trying to generate.

hmm, how exactly would i reproduce that problem?  i have an up-to-date
LOGON tree, where i do:

  (rsa :terg t)
  (lkb::do-parse-tty "abrams barked in berlin.")

and then click `Generate' in LUI.  that works as expected, and i guess
at least the preposition has a non-string predicate?

i am loading from source, admittedly, but i suspect dan does too, or?

                                                       cheers  -  oe

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