* annotations.py: Annotation class for two-way annotations. Does only support

exactly two dimensions.

test/system/annotationtest.py

@@ -0,0 +1,19 @@
+
+import unittest
+import sys
+sys.path.append('../../system')
+from annotations import *
+
+class AnnotationTest(unittest.TestCase):
+
+    def setUp(self):
+        pass
+
+    def testCreation(self):
+        a = Annotations('x', 'y')
+        assert a.has_dimension('x')        
+        assert a.has_dimension('y')        
+        assert not a.has_dimension('z')        
+
+if __name__ == '__main__':
+    unittest.main()