Python: Move library to correct location.

python/ql/src/semmle/python/security/Paths.qll

@@ -0,0 +1,25 @@
+import python
+
+import semmle.python.security.TaintTracking
+
+query predicate edges(TaintedNode fromnode, TaintedNode tonode) {
+    fromnode.getASuccessor() = tonode
+}
+
+private TaintedNode first_child(TaintedNode parent) {
+    result.getContext().getCaller() = parent.getContext() and
+    parent.getASuccessor() = result
+}
+
+private TaintedNode next_sibling(TaintedNode child) {
+    child.getASuccessor() = result and
+    child.getContext() = result.getContext()
+}
+
+query predicate parents(TaintedNode child, TaintedNode parent) {
+    child = first_child(parent) or
+    exists(TaintedNode prev |
+        parents(prev, parent) and
+        child = next_sibling(child)
+    )
+}