Method stubs for ZPObject class.
Method stubs for Region class
Segment class - method stubs and bodies.
Segment bug fixes.
Region body
Adding __init__.py file.
Segment extension
Region bug-fixes
ZPObject body
Adjustments in Segment and REgion classes
Loading objects
Adding comments to the code in Segment
Adding comments in Region and improvements in Segment
Adding comments in ZPObject and improvements in Region
Adding comments in __init__.py
ZP tests
ZPObject bug-fixes