Reinstated removed method

Author: sebastian-peter

src/main/java/edu/ie3/datamodel/models/input/connector/TransformerInput.java

@@ -80,6 +80,9 @@ public int getTapPos() {
     return tapPos;
   }
 
+  @Override
+  public abstract TransformerInputCopyBuilder<? extends TransformerInputCopyBuilder<?>> copy();
+
   @Override
   public boolean equals(Object o) {
     if (this == o) return true;
@@ -124,7 +127,7 @@ public String toString() {
    * @version 0.1
    * @since 05.06.20
    */
-  abstract static class TransformerInputCopyBuilder<B extends TransformerInputCopyBuilder<B>>
+  public abstract static class TransformerInputCopyBuilder<B extends TransformerInputCopyBuilder<B>>
       extends ConnectorInputCopyBuilder<B> {
 
     private int tapPos;