Cleaned source material
Files in this provenance layer:
- source/README.md
- source/ires/00-front-matter.md
- source/ires/01-introduction.md
- source/ires/02-scope.md
- source/ires/03-siec.md
- source/ires/04-units.md
- source/ires/05-flows.md
- source/ires/06-statistical-units.md
- source/ires/07-data-collection.md
- source/ires/08-balances.md
- source/ires/09-quality.md
- source/ires/10-dissemination.md
- source/ires/11-uses.md
- source/ires/12-annexes-references.md