Made a lot of test for the speed comparison between the kd-tree and the
fastkdtree. Added a lot of line in the testmain.cpp, to build a kdtree
and a fastkdtree out of a ply-file.
Thanks to Simon for the tip to use ply-files. Really makes fun to see
the result in MeshLab (a program to visualize ply-files)!

~FIX: made the int-vector for indices to an unsigned int (hpuint)
vector. Otherwise I would had to convert every single number to
unsigned.
Merge branch 'fastkdtree-SS13-group1' of https://github.com/happah-graphics/happah into fastkdtree-SS13-group1