fix keyword typo

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
auto meshing: more debug info's

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
fix in mesh symmetry check function

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
discrete material: new option to use database for material index 0 (new default)

Use xml-keyword: 'UseDBBackgorund' set to 0 to use default property material for index 0

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
doc: update doc for AddDiscMaterial

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>