This keeps things simpler by not dealing with redundant implementations
for single change and multiple changes.
This also let regions handle related changes in a more efficient way
(for example recalculates region components only when needed).
Added some missing license blocks
Added "and contributors" to all copyright notices.
Added $Id$ to files that were still missing it.
Changed "All rights reserved" to GPLv3 on Injector.java.
- CuboidSelection no longer deals with IncompleteRegionExceptions
- Fixed Polygonal2DSelection not passing its region to the selector
- Fixed Polygonal2DRegion not cloning the list it receives in its constructor
- Gave PolygonalRegionSelector a new constructor where it takes a list of points