tests for crossing iter ranges

tests/data/crossing.ccl

+tagset=kipi
+sentence=t01.xml
+---
+rlook(0, 1, $It, True)
+
+True
+It=0
+---
+llook(1, 0, $It, True)
+
+True
+It=1
+---
+rlook(1, 0, $It, True)
+
+False
+It=nowhere
+---
+llook(0, 1, $It, True)
+
+False
+It=nowhere
+---
+only(0, 1, $It, True)
+
+True
+It=1
+---
+only(1, 0, $It, True)
+
+True
+It=nowhere
+---
+only(1, 0, $It, False)
+
+True
+It=nowhere
+---