Add confidence interval for wer utility
Delete AFE+CMVN setups, not needed here
Fix forgot-to-rename bug in aurora-2 macro
Add lexicon object
Add a pre-processing step in scripts
Introduce lexicon object into aurora-4 scripts
Rename Aurora4AM -> Aurora4AMGMM, to meet the other branches
Move HCLG construction to transcription stage
This is the default value now
Add standard recipe into aurora-4 main object
Merge branch 'sigtest'
Merge branch 'aurora4'

Conflicts:
	mods/aurora4/amtrain.zmod
	run_exps/feature_baseline/test.zsh
Add baseline of Aurora-4
Add a feature-only mode for baseline script