PointVector is now a template class, allowing arbitrary-dimensional PointVectors
Added comparison functions, new costructor to PointVector
Added cross product for 3- and 7-dimensional PointVectors
Fixed PointVector.cpp include problems
Added static versions of arithmetic methods
Fixed reference requirements in PointVector
Added normalization methods to PointVector
Fixed indent issues
Merge branch 'pvect' into physobj
Fixed Author text

Conflicts:
	PhysObject.h
	PointVector.cpp
	PointVector.h