* It's a global option not a document level setting (like other compatibility
options) so I created a separate section on the GUI for this option on the
same tab page.
* In the configuration the option is placed under Compatibility/View since
the existing Compatibility/FormattingOptions seems related to document formating
and not the GUI.
* Since it was added with a new configuration root I needed to add also a new
ConfigItem derviative class to handle this option.

Change-Id: I54668ae9808a1ca3c3b7fe81f2f201720257b3fb
Reviewed-on: https://gerrit.libreoffice.org/67902
Tested-by: Jenkins
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>