Python: Add copy of internal Python 2 tests

These are mostly extractor tests, which now live in `2/extractor-tests`,
and a single library tests that was added to the existing directory.

python/ql/test/2/extractor-tests/normalise/Numbers.expected

@@ -0,0 +1,7 @@
+| int 0 | 0 |
+| int 1 | 1 |
+| int 2 | 2 |
+| int 123745 | 123745 |
+| int 268435455 | 268435455 |
+| int 17216961135462248174 | 17216961135462248174 |
+| int 100000000000000000000000000000000000000000000 | 100000000000000000000000000000000000000000000 |

python/ql/test/2/extractor-tests/normalise/Numbers.ql

@@ -0,0 +1,17 @@
+/**
+ * Much of the QL library handling integral values assumes that 
+ * equivalence of the DB entities implies equivalence of the 
+ * Python object and vice-versa.
+ * In Python 2, 1L == 1, which can cause problems, so we 
+ * normalise all longs to ints. 
+ */
+
+import python
+
+from NumericObject n
+where
+exists(IntegerLiteral i |
+    i.getLiteralObject() = n |
+    i.getEnclosingModule().getFile().getShortName() = "test.py"
+)
+select n.toString(), n.repr()

python/ql/test/2/extractor-tests/normalise/test.py

@@ -0,0 +1,23 @@
+
+#ints
+0
+0L
+1
+1L
+2
+2L
+123745
+123745L
+
+0xfffffff
+0xfffffffL
+
+#Avoid values between 32 and 64 bits, as long is 32 bits on windows and 64 bits on 64 bit linux machines.
+
+
+
+#longs
+0xeeeeeeeeeeeeeeee
+0xeeeeeeeeeeeeeeeeL
+100000000000000000000000000000000000000000000
+100000000000000000000000000000000000000000000L