The format used is column orientated and allows quick import and
export of the table content. This will be used for the external data
to cache the results of each transformation step in the UI.

Change-Id: I6e1bfd3b3384cbfadeb98fb995dfd0b03d5e6eb6
Reviewed-on: https://gerrit.libreoffice.org/41198Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>