v5 v6: ao, auto naming (segment & tag), exceptions, avoidance of name collisionssisu_5.6.6

* (i) auto naming attempts to extract a suitable numeric name from document
  headings if available, at times one appears to be available but is re-used
  elsewhere in the document, (as where the document has Parts or Sections and
  naming starts again within these sections from 1); (ii) this is treated as an
  exception and an alternative sequential naming scheme is triggered; (iii) if a
  document heading does not provide a suitable numeric name, another sequential
  scheme is used

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