[treelang] Fix external references and argument-less functions

[James A. Morrison]

 Hi,

  This patch allows treelang files with external_references to compile, as
they are documented to.  It also allows functions that take no arguments to
be called.  This patch has been tested with make tree1 and make check-treelang.
I'm currently bootstrapping and regtesting on sparc-linux.  Ok for mainline if
the testing passes?

-- 
Thanks,
Jim

http://www.student.cs.uwaterloo.ca/~ja2morri/
http://phython.blogspot.com
http://open.nit.ca/wiki/?page=jim

treelang.05-3.patch
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