HATCH: corrections in messages.

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

Signed-off-by: bert <bert.timmerman@xs4all.nl>
HELIX: corrections in messages.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
IMAGE: test for linetype in dxf_image_write().

Signed-off-by: bert <bert.timmerman@xs4all.nl>
IMAGE: corrections in messages.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
INSERT: corrections in messages.

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