v5: output structure by, monolingual alternative for :filetype or :filename

* filename without language code, if document is in default language
* set a default language, 'en' or as specified
* set in rc file or from command line instruction
  * command line e.g.
    sisu -hv --monolingual --by-filename sisu_markup.sst
    sisu -3v --monolingual --by-filetype sisu_manual.ssm
  * sisurc.yml lingual: 'mono' | 'multi'
    lingual: 'mono'
* note: output by :filetype is roughly equivalent to what monolingual output
  by :language would be
* allow command line setting of default language using language code
  --default-language='en' --default-lang-en if used together with
  --monolingual and --by-filetype or --by-filename the selected default
  language document will not have a language code in the output filename

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