rather than just a simple struct.  I also added overloaded +, -, *, and / operators
for this object so you can do the kind of arithmetic you would expect on an object
which represents a point in a vector space.  This breaks backwards compatibility
with the previous interface though as the member variables are now private.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%404124