Support for Visual Studio 2005

[Sam Hayne]

Have a look in the mail I left here a few days ago:
http://lists.alioth.debian.org/pipermail/libkdtree-devel/2008-November/00017
8.html

Didn't know better than declaring some private members public as VC compiler
complained about them.
I'm sure Paul works out a better method or already did. :)
In the meanwhile the same changes as I did should at least get you started. 

Sam