removed libkdtree++ dependency.

Docs/3rdparty.txt

@@ -1,6 +1,6 @@
 Third Party Libraries:
 
+Scons		1.3+
 Boost		1.37+
-kdtree++	0.7+	(0.62 does not work with g++ 4.0+)
 sparsehash 	1.4+
 stxxl		1.2.1+

Docs/Todo.txt

@@ -5,6 +5,4 @@ Start/Endpoints of queries can only start on nodes only. Instead of selecting th
 
 The server part is mostly adapted from the boost http examples. It should be replaced with a self-written front-end
 
-The KD-Tree uses a lot of RAM. An own implementation might be better.
-
 Use Boost to compress all in-/output streams to the file system