python: longer name and longer comment

Author: yoff

python/ql/lib/semmle/python/ApiGraphs.qll

@@ -987,7 +987,7 @@ module API {
     DataFlow::LocalSourceNode trackUseNode(DataFlow::LocalSourceNode src) {
       Stages::TypeTracking::ref() and
       result = trackUseNode(src, DataFlow::TypeTracker::end()) and
-      result instanceof DataFlow::LocalSourceNodeNotModule
+      result instanceof DataFlow::LocalSourceNodeNotModuleVariableNode
     }
 
     /**

python/ql/lib/semmle/python/dataflow/new/internal/LocalSources.qll

@@ -140,10 +140,12 @@ class LocalSourceNode extends Node {
 /**
  * A LocalSourceNode that is not a ModuleVariableNode
  * This class provides a positive formulation of that in its charpred.
+ *
+ * Aka FutureLocalSourceNode (see FutureWork below), but until the future is here...
  */
-class LocalSourceNodeNotModule extends LocalSourceNode {
+class LocalSourceNodeNotModuleVariableNode extends LocalSourceNode {
   cached
-  LocalSourceNodeNotModule() {
+  LocalSourceNodeNotModuleVariableNode() {
     this instanceof ExprNode
     or
     this.asVar() instanceof ScopeEntryDefinition