Move unittest from lib to pkg.

tests/html/svg_3_test.dart

 #library('SVG3Test');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
+#import('../../pkg/unittest/unittest.dart');
+#import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 // Test that SVG elements have the operations advertised through all the IDL
 // interfaces.  This is a 'duck typing' test, and does not explicitly use 'is'
 // checks on the expected interfaces (that is in SVGTest2).
 
 main() {
 
   insertTestDiv() {
     var element = new Element.tag('div');
@@ skipping 105 matching lines @@
 
   testRect('rect_SVGTests', checkSVGTests);
   testRect('rect_SVGLangSpace', checkSVGLangSpace);
   testRect('rect_SVGExternalResourcesRequired',
            checkSVGExternalResourcesRequired);
   testRect('rect_SVGStylable', checkSVGStylable);
   testRect('rect_SVGLocatable', checkSVGLocatable);
   testRect('rect_SVGTransformable', checkSVGTransformable);
 
 }