We're now set up to support automated unit tests. Besides the fact

that I like unit tests, my Unicode conversion work is going to have to
be thorougly tested for reasons I will outline in
http://thdltools.sf.net/BuildSystems.html later today.

Added the freely licensed JUnit 3.8.1 binary to the repository, along
with some README files.  Added a new supporting buildfile,
junitbuild.xml.  'ant clean check' is now good to go (though it uses
the text UI for JUnit, and some developers may want the Swing GUI)

Also, I cleaned up build.xml a bit, including adding all buildfiles
(but not junit.jar and things like that) to the source distribution
('ant src-dist') rather than just build.xml.

extensions/README.TXT

@@ -0,0 +1,5 @@
+This directory is where we place third-party JARs of which our
+software is a client.  The subdirectory to-be-installed-with-ant/
+contains a README file for you, also.
+
+See 'http://thdltools.sf.net/BuildSystems.html' for more info.

extensions/to-be-installed-with-ant/README.TXT

@@ -0,0 +1,8 @@
+Copy the JARs in this directory into Ant's lib/ directory (i.e.,
+$ANT_HOME/lib, the same directory where 'optional.jar', shipped with
+Ant, lives).  The build system has been designed so that you needn't
+do this to do basic development activities, but some build targets are
+only functional if you perform this step.
+
+See http://thdltools.sf.net/BuildSystems.html for more info.
+