Extend the existing initial support for the OOXML invertIfNegative tag to pass
the data down into bar and bubble chart rendering. Also add corresponding unit
tests. This does not include a UI control to select/deselect the invert-if-
negative option, nor support for export of the flag to OOXML, nor any support
in ODF.
Change-Id: I45b24b816edc379c9b431e86269dd5ff37977b89
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171879
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
4c45ce3493