TABLE: added id_code to the struct.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
TABLE: added code to dxf_table_write().

Signed-off-by: bert <bert.timmerman@xs4all.nl>
TABLE: according to R10..R14.

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