Summary of changes:
- A new function, P_AssignMaterial. Assign material with the specified name from material liberary to selected object.
- Geometry > Create > Instance > Create Mirror Intance_X/Y/Z. Create a mirrored instance at world/workplane X/Y/Z axis.
- "Copy" and "Paste" buttons are added to "Manipupation" window to pass position/rotation/size between selections.
- Some bug fixings.