v2.0.3

Changed

• ldh-CreateContainer and ldh-CreateItem only create: the PUT
  carries If-None-Match: * and no If-Match, as LinkedDataHub's CLI create
  commands and its client's create forms send it, so a document already at
  the URI is refused 412 and left as it is, and the operation fails. They
  read the document's entity tag and quoted it before, which made a create on
  an existing URI replace the document whole, its content blocks with it. A
  new if_absent argument (xsd:boolean) accepts the existing document as the
  result instead, like mkdir -p, and does not count it as a write to an
  enclosing ForEach. Their kind is write, no longer destructive. A
  pipeline that relied on a create replacing a document PUTs it;
  ldh-GenerateClassContainers, which creates through ldh-CreateItem, now
  stops on a class whose item already exists instead of replacing it.