Python: Rewrite call-graph tests to be inline expectation (1/2)

This adds inline expectations, next commit will remove old annotations
code... but I thought it would be easier to review like this.

python/ql/test/experimental/library-tests/CallGraph/code/class_simple.py

@@ -25,13 +25,13 @@ class A(object):
 a = A(42)
 
 # calls:A.some_method
-a.some_method()
+a.some_method() # $ pt=A.some_method
 # calls:A.some_staticmethod
-a.some_staticmethod()
+a.some_staticmethod() # $ pt=A.some_staticmethod
 # calls:A.some_classmethod
-a.some_classmethod()
+a.some_classmethod() # $ pt=A.some_classmethod
 
 # calls:A.some_staticmethod
-A.some_staticmethod()
+A.some_staticmethod() # $ pt=A.some_staticmethod
 # calls:A.some_classmethod
-A.some_classmethod()
+A.some_classmethod() # $ pt=A.some_classmethod

python/ql/test/experimental/library-tests/CallGraph/code/runtime_decision.py

@@ -18,7 +18,7 @@ else:
     func = rd_bar
 
 # calls:rd_foo calls:rd_bar
-func()
+func() # $ pt=rd_foo pt=rd_bar
 
 # Random doesn't work with points-to :O
 if random.random() < 0.5:
@@ -27,4 +27,4 @@ else:
     func2 = rd_bar
 
 # calls:rd_foo calls:rd_bar
-func2()
+func2() # $ pt=rd_foo pt=rd_bar

python/ql/test/experimental/library-tests/CallGraph/code/simple.py

@@ -16,12 +16,12 @@ lam = lambda: print("lambda called")
 
 
 # calls:foo
-foo()
+foo() # $ pt=foo
 # calls:foo
-indirect_foo()
+indirect_foo() # $ pt=foo
 # calls:bar
-bar()
+bar() # $ pt=bar
 # calls:lam
-lam()
+lam() # $ pt=lambda[simple.py:15:7]
 
 # python -m trace --trackcalls simple.py

python/ql/test/experimental/library-tests/CallGraph/code/underscore_prefix_func_name.py

@@ -18,11 +18,11 @@ def _ignored():
 def _works_since_called():
     print('_works_since_called')
     # calls:some_function
-    some_function()
+    some_function() # $ pt=some_function
 
 def works_even_though_not_called():
     # calls:some_function
-    some_function()
+    some_function() # $ pt=some_function
 
 globals()['_ignored']()
-_works_since_called()
+_works_since_called() # $ pt=_works_since_called