extract method parameters suggester: change method copy context so calls inside method body could be resolved (aClass..getTypeParameterList() passed inside MethodElement.copyElement && aClass.processDeclarations implementations together cause that method calls to same class members can't be resolved); teach DuplicatesFinder to work on non-physical elements with correct context

java/java-tests/testData/refactoring/extractMethod/SuggestChangeSignatureCallToSameClassMethod.java

@@ -0,0 +1,12 @@
+class B {
+  void readFile(String s, Class c) {}
+
+  {
+    <selection>
+     readFile("foo", B.class);
+     this.readFile("foo", B.class);
+    </selection>
+    readFile("bar", B.class);
+    this.readFile("bar", B.class);
+  }
+}

java/java-tests/testData/refactoring/extractMethod/SuggestChangeSignatureCallToSameClassMethod_after.java

@@ -0,0 +1,15 @@
+class B {
+  void readFile(String s, Class c) {}
+
+  {
+
+      newMethod("foo");
+
+      newMethod("bar");
+  }
+
+    private void newMethod(String foo) {
+        readFile(foo, B.class);
+        this.readFile(foo, B.class);
+    }
+}