initial update to 5.0.0

initial update to 5.0.0

- updated patches
- configure-spaces.patch no longer needed
- new no-scrextend patch to remove scrextend package ref from
  docbook2latex (not present in PLD)
- new version-error patch to remove awkward #error preprocessor rule for
  seemingly valid scenario
- introduce new bcond all_langs used for enabling all doc translations,
  disable by default as fr_FR manual is incomplete
- provide docbook dtd location which is now required for doc validation
- rel 0.1 but builds and seems to work