d: po4a, continue reorganization (translation request dev stopped)

* --po4a run against different language versions of sisu markup
  files (representing the same document in different languages)
  initializes po4a structure to place those documents under future
  po4a management
* includes command line translation request
  (use command line program 'trans' to pass request to
  translation.google.com, stopped for now)
  NOTE in case future development is restarted: to test, remove
  code line 'auto_translate?(:skip)' that follows
  'def auto_translation(src_txt,markup=:src)'; place identical
  english sisu markup files in en/test.sst fr/test.sst (or under
  the language code to be tested) and run against en/test.sst
  fr/test.sst e.g. '--po4a --trans --glob test.sst'
  this send identical text objects to translate.google using
  'trans' and populate po file with results for placing future
  translation under po4a management, however in initial tests
  insufficient cleanly translated paragraphs were returned,
  so stopped development for now. (no attempt at initialization
  of new non-existent files using --trans-en:es,fr,de format)
* [hub_options, if development of trans is pursued later consider
  the possibility of modifying the --trans string options to add
  an optional timeout value, &; possibly modifying po4a code so
  timeout may occur a fixed number of times before skipping
  translation request attempts for the remainder].

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