emphasis display and plaintext line wrap configurable in document or sis

* markup for *{emphasis}* configurable as being displayed either bold or
  italics, the default is that emphasis output is in bold so there is no
  at present unless configured, either in sisurc.yml (default: emphasis:
  'italics'), or the markup source document header @make: :emphasis: 'it
  [requested]

* plaintext, wrap width configurable between 20 to 200 characters, the
  default width being 78, configuration eithe rin sisurc.yml (default: t
  78), or the markup source document header (@make: :plaintext_wrap: 78)

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