cwarxml2txttgn.sh: Fix numerous bugs in this script
SplitDevTest: Sort files before splitting to make it deterministic
ConvertCwarToGoldCorpus/prepare-cwar.sh: Major rewrite, make it more robust and include files in sorted order
TrXMLSource: Better error messages, various cleanups
New IOUtil.createBufferedReader to handle auto-decompression, use everywhere