First successful version

- names of bool flags in renderer was changed to display_*
- segmentation and graph_cut is merged into Label with integer parameter
- graph_cut is not working properly: parameter tuning is required
- transformation is now working, but didn't checked: not compared with
MATLAB version
- 3D point set in Point-space (color-space) is now removed; replaced by
skeleton frame
- Some checking functions are added to Player
- It is required to add check-functions for rendering and separate mode
change and display change (and their dependency)