Treelang update

[Tim Josling]

More than a few days ago I said I should have treelang installed in a
few days.

I think it is ready but I am having some troubles building GCC and
running tests. Sometimes GCC is returning 1 when there are warnings
only. This is in gnu/linux Red Hat 7.1. I have so far traced the problem
to the bool data type. Some modules are getting one definition and some
are getting another. This messes up the error handling structure offsets
and causes confusion about where the errorcount is vs the warningcount.

The problem is very fragile though as if I touch the relevant modules
and remake it sometimes fixes the problem. It might take me a little
while to track this one down.

Tim Josling