Use point class.
1) Reactivate clone code. 2) Begin 3d transform code.
1) Use Point class. 2) Use own drawLine. 3) Remove unused code.
Remove invalid field.
1) Add basepntz. 2) Add comments.
Add basepnt to print blocks list.
Add basepntz.
Eliminate class YdxfGrpKeyword.
Initial revision
