enable creator select in Editor handler

Allow the type of creator (<origination> )to be changed by
the presence of a sub-tag (e.g. <persname>, <corpname>).
In such cases, remove all sub-tags and text nodes to avoid
duplication.
add JavaScript for creator type select in Editor

- Enhance `cloneField` function

- Add onload function to attach behaviour to the creator type
  selector to change the name of the input for the creator name
add creator type selector in Editor XSL