This is just the import side, the export side still needs doing.
The used attribute was already part of ODF, and NumberingLevel for para
styles where already imported/exported for DOCX.
Change-Id: I8385ed23dc799c99e81318387236341b404d01a7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121515
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins