Rewrite the get_filelist function, now also handles archives

Also, deal with set name aliases within that function, instead of
outside.
fixed #1
Add an utility from Kaldi to normalize WSJ-like transcriptions
Fix bad usage message and file source in wsj transcription normalization script
Add an utility to fix WSJ's arpa lm
Add an utility to pick transcriptions from WSJ corpus
Add an utility to pick entries from lexicon
Make $2 of get_name in base classes optional
New base class: Kaldi acoustic model
Add ARPA LM object and force Kaldi AM to use that
Base class for word lattices
Make transcription can also come from word lattice, with a lm model
Change the way we get base class name of objects
First version of Aurora-4 script, works but performs very bad
Merge branch 'aurora4'
Clear perl semantic
Add generate label and wordlist function to conform corpus API
Install WER in aurora-2 after verification

fixed #3
Merge branch 'aurora2'