example for sx-scripthash
add example for rawscript
split out sx blockchain commands that query obelisk, versus those that hit blockchain.info and blockexplorer
note that sx balance is in satoshis
put showtx in a new TRANSACTION PARSING category, to emphasize that this command can be run with no network/blockchain connection
improve help message for fetch-transaction
improve help message for show-tx, uses actual transaction in block chain rather than txfile.tx that user doesnt have