ref_transaction_commit(): use a string_list for detecting duplicates

Detect duplicates by storing the reference names in a string_list and
sorting that, instead of sorting the ref_updates directly.

* In a moment the string_list will be used for another purpose, too.

* This removes the need for the custom comparison function
  ref_update_compare().

* This means that we can carry out the updates in the order that the
  user specified them instead of reordering them. This might be handy
  someday if, we want to permit multiple updates to a single reference
  as long as they are compatible with each other.

Note: we can't use string_list_remove_duplicates() to check for
duplicates, because we need to know the name of the reference that
appeared multiple times, to be used in the error message.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>

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