io: Shorten local_file_handler -> localfh, std_file_handler -> stdfh
Don't output extraneous info when computing stats
Don't output stats at all unless debug("docstats")
Do output stats when generating rerank feature vectors
Output feature-vector debug info if debug("combined-features")
ParseTweets: Fix handling of --output-fields (default value, 'unigram-counts', 'ngram-counts')
textdb: Fix running from Scoobi (temporary fix)
textdb: Only allow .schema.txt, .data.txt endings (not old -schema.txt etc.)
textdb: Fix bug handling compression endings
FrobTextDB: Lots of changes, add --add-field-by-index