trunk: changes to compressed-matrix code: make it more time and space efficient for matrices with <= 8 rows; bug fix (won't affect any recipes).

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4626 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
Various script fixes; new version of an nnet-retraining script.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4627 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: perturb the speed of the data(using sox)

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4630 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: add the example script which demonstrates how speed perturbation of the data helps the nnet training

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4631 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8