LAYER: implemented DXF_DEBUG macros.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
LINE: implemented DXF_DEBUG macros.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
LTYPE: implemented DXF_DEBUG macros.

Signed-off-by: bert <bert.timmerman@xs4all.nl>