* v5 invocation available as legacy, but is the same as v6
* qi_libs, gem metadata, minor
* sisu_packaging.org: ruby require list; update sisu description
* bin/ chmod 755

* creates source language directory with source markup files
  (.sst .ssm .ssi) & the po4a.cfg configuration file, then runs
  po4a to place the markup source under po4a translation
  management
* --po4a-sst uses original sisu markup source as described above
* --po4a-ao passes sisu source markup through document abstraction
  before converting back to a sisu markup source markup equivalent
  of the original document, it does this in an attempt to get more
  uniform output, and put footnotes for example if any in a form
  that is easier to translate
  --po4a-ao -v --trans-en:fr,es en/live-manual.ssm
  --po4a-ao -v --trans-en:fr,es en/live-manual.ssm \
    es/live-manual.ssm
  in the latter example also runs sisu marked up "es" document
  through document abstraction and returns a sisu markup source
  version of the document, and against this gettext is (or can be
  run) to (attempt to) have the source and target languages
  together in the po/es file
* all quite rough, will need to be revisited,
* these for now replace the renamed --po4a-shelf (formerly --po4a)

* uses po4a to create po files with empty translation strings
* in appropriately configured directory e.g.
  "data/doc/sisu/markup-samples/manual" have file named:
  "languages_source_and_targets" containing e.g.:
    source: en
    targets: de fr es ja ru zh
  command examples:
    ruby ~snx/bin/sisu-misc-utils po4a --next --clean
    ruby ~snx/bin/sisu-misc-utils po4a --next --distclean
    ruby ~snx/bin/sisu-misc-utils po4a --next --make