v4: merge v5, syntax additions, block text related (version bump to 4.2.*)

* syntax add
  * switch ocn off and on for a block of content, line containing only
    off: "--~#" (omit headings where possible) "---#" on: "--+#"
  * alternative open and close for blocks using line starting with "```", e.g.
    open code block:  "``` code"; close code block: "```"
    start poem:       "``` poem"; end poem:         "```"
  * remove need for an empty line between opening & closing of a text block
  [ note further refinements will be required;
    use of tildes "~~" considered but more problematic, tics not used elsewhere]

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