[ltk-user] LTK improvements

[Jan Rychter]

I have a fairly large bunch of changes to ltk, mostly having to do with
the text widget, but also with support for new widgets from the BWidget
toolkit (such as tree).

I am not completely happy with these changes, as I am sure they require
further work and/or review. They can likely be implemented much
better. But since I haven't found the time to do so over the last 2
months, I thought I'd rather push them out, to prevent wasting of time
in case somebody is doing the same thing in parallel.

Should I send the diffs to the list, or directly to Peter? Please note,
they definitely do require reviewing.

--J.