Streamline chapter (child work) creation process

[rhigman]

User feedback: it's time-consuming to add the same basic metadata (copyright, author, institution, etc) for multiple chapters of a parent work. Potential solution: add "create child" button which duplicates the parent record - the new record can then be minimally edited as necessary (copy cataloguing).

[rhigman]

Also prioritise making Relations editable, as it is easy for human error to creep in when creating large numbers of chapters.