HATCH: edits in comments.

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

Signed-off-by: bert <bert.timmerman@xs4all.nl>
global.h: correction of a Doxygen comment.

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