- enable linear hidden : instead of prob(v_to_h()): use toHiddenProbs()
- enable linear visible: instead of prob(h_to_v()): use toVisibleProbs()
- make v_to_h() and h_to_v() private and force to use toHiddenProbs() and toVisibleProbs()
- use cd_jens or cd_hinton. cd_hinton_hid_lineaer is not of use anymre, since it is not capable of CDn