trunk: updates and fixes to some nnet2 training scripts, add 'accelerated' version of multisplice script.  No example scripts yet (still tuning).

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4717 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: fix src/Makefile lm dependency fstext was missing

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4718 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: Restore the interval-set patch for OpenFst-1.3.4.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4719 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8