ODF has the attribute table:embedded-number-behavior to specify a
natural sort (19.628 part3 ODF 1.4). Its values are 'alpha-numeric',
'double' and 'integer'. LO has the attribute bool bNaturalSort in struct
ScSortParam. The ODF method 'integer' is not implemented in LO.
The patch maps the internal bNaturalSort=true attribute to ODF value
'double'. Until value 'integer' is implemented, it is mapped to value
bNaturalSort=true on import, as that makes at least a natural sort.
This is next step after commit 47eb7f4e4d
Change-Id: Ie8c66e6b2eb2bdf035f0b02ada6ef91b1d921fe7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/190437
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>
Tested-by: Jenkins