added script for appending BVH files
fixed append_bvhs.py
fixed rotation bug in BvhReader which was introduced in 85b350a48dd738c559cbc2f48bb2d55a55c51da0. the bug was discovered when playing back hb-hrf2.bvh
Merge branch 'dim_reduction_pyqt' of github.com:gaborpapp/AIam into dim_reduction_pyqt