* Add HoriAlignIgnoreTrailingWhitespace compatibility option.
** For MSO file formats it is set to true
** For ODP format it's set to false by default
** The flag is saved to ODP format as user data if the document
comes from an MSO format.

Change-Id: Ie22233d33a25e605de46120bfc2195038dffd63c
Reviewed-on: https://gerrit.libreoffice.org/49889Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>