Rerank/LangModel: Set --rerank-lang-model same as --lang-model by default
GridLocate: split params into separate traits, some cleanup
Debug: Separate params with comma, separate items in multi-val params with colon
Perceptron: Add '--debug perceptron-weight-sum'
Rerank: Make --rerank a flag
experiment: sort outputted param names for easier diffing in case we rearrange param order in source file
metering: some cleanup of mapMetered/etc. pimps (FIXME, has type issues)
fixup: Perceptron always display weight sum
Memoize: synchronize memoizer fns for correct parallel operation
Rerank: score -> rank-score and clean up
Rerank: Implement parallel feature computation (FIXME: not enabled yet)
FIXME: Rerank: Partially implement random starting/restarting
Classifier: Clean up debug-weights output
argparser/Cleanup: clean up example code a bit
argparser/cleanup: fix formatting of some error msgs
argparser/etc: Add and use catch_parser_errors to avoid backtraces from parser errors
argparser/etc.: Implement 'must' for value restrictions
argparser: Add isParsed, parsedValues, correct comment
All apps: Eliminate handle_parameters(), check_usage(); incorporate into Params classes
Perceptron: Implement --perceptron-decay