#4212 Putting it back.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33371 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
AngleBisector(three 3D points)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33372 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e