Now either all or none of equals/hashCode/canEqual is generated. Fixes issue 240.

test/transform/resource/after-ecj/EqualsAndHashCodeWithExistingMethods.java

@@ -0,0 +1,27 @@
+@lombok.EqualsAndHashCode class EqualsAndHashCodeWithExistingMethods {
+  int x;
+  EqualsAndHashCodeWithExistingMethods() {
+    super();
+  }
+  public int hashCode() {
+    return 42;
+  }
+}
+final @lombok.EqualsAndHashCode class EqualsAndHashCodeWithExistingMethods2 {
+  int x;
+  EqualsAndHashCodeWithExistingMethods2() {
+    super();
+  }
+  public boolean equals(Object other) {
+    return false;
+  }
+}
+final @lombok.EqualsAndHashCode(callSuper = true) class EqualsAndHashCodeWithExistingMethods3 extends EqualsAndHashCodeWithExistingMethods {
+  int x;
+  EqualsAndHashCodeWithExistingMethods3() {
+    super();
+  }
+  public boolean canEqual(Object other) {
+    return true;
+  }
+}