Added "ImproveCacheLocality"-Step; Added Unit tests (3 at the moment); Fixed hp spelling errors.

Added "ImproveCacheLocality"-Step; Added Unit tests (3 at the moment); Fixed hp spelling errors.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@68 67173fc5-114c-0410-ac8e-9d2fd5bffc1f