Patches to test/unit

I believe these are the minimal patches needed to make it possible to 
use autorunner's directory collector from the command line:

	% ruby -r test/unit/autorunner -e 'Test::Unit::AutoRunner.run'
	Loaded suite .
	Started
	...[etc]

<532> cvs -q diff -du
Index: unit.rb
===================================================================
RCS file: /src/ruby/lib/test/unit.rb,v
retrieving revision 1.7.2.4
diff -d -u -r1.7.2.4 unit.rb
--- unit.rb     16 May 2004 13:39:58 -0000      1.7.2.4
+++ unit.rb     18 Dec 2004 09:45:04 -0000
@@ -270,13 +270,7 @@
  # missing points, etc., in this document (or any other).
  #
    module Unit
-    def self.run=(flag)
-      @run = flag
-    end
-
-    def self.run?
-      @run ||= false
-    end
+    # nothing here but rdoc
    end
  end

Index: unit/autorunner.rb
===================================================================
RCS file: /src/ruby/lib/test/unit/autorunner.rb,v
retrieving revision 1.8.2.1
diff -d -u -r1.8.2.1 autorunner.rb
--- unit/autorunner.rb  16 Nov 2004 02:19:44 -0000      1.8.2.1
+++ unit/autorunner.rb  18 Dec 2004 09:45:04 -0000
@@ -3,6 +3,15 @@

  module Test
    module Unit
+
+    def self.run=(flag)
+      @run = flag
+    end
+
+    def self.run?
+      @run ||= false
+    end
+
      class AutoRunner
        def self.run(current_file=nil, default_dir=nil, argv=ARGV, 
&block)
          if(!current_file || current_file == $0)
Index: unit/collector/dir.rb
===================================================================
RCS file: /src/ruby/lib/test/unit/collector/dir.rb,v
retrieving revision 1.4
diff -d -u -r1.4 dir.rb
--- unit/collector/dir.rb       24 Dec 2003 05:08:03 -0000      1.4
+++ unit/collector/dir.rb       18 Dec 2004 09:45:04 -0000
@@ -1,4 +1,5 @@
  require 'test/unit/testsuite'
+require 'test/unit/testcase'
  require 'test/unit/collector'

  module Test