SEQEND: changes in Doxygen comments.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
SEQEND: added dxf_seqend_new().

Signed-off-by: bert <bert.timmerman@xs4all.nl>
SEQEND: added dxf_seqend_init().

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