(parse_transaction): Improved the @ check (scanning for a transaction cost) so that it skips quoted symbol names and value expressions.
(parse_transaction): Improved the @ check (scanning for a transaction
cost) so that it skips quoted symbol names and value expressions.

duncanmortimer/ledger,duncanmortimer/ledger,jwakely/ledger,duncanmortimer/ledger,afh/ledger,jwakely/ledger,jwakely/ledger,jwakely/ledger,ledger/ledger,duncanmortimer/ledger,jwakely/ledger,duncanmortimer/ledger,duncanmortimer/ledger,paulbdavis/ledger,paulbdavis/ledger,paulbdavis/ledger,paulbdavis/ledger,paulbdavis/ledger,ledger/ledger,jwakely/ledger,paulbdavis/ledger,ledger/ledger,ledger/ledger,duncanmortimer/ledger,jwakely/ledger,afh/ledger,paulbdavis/ledger,afh/ledger,afh/ledger,ledger/ledger,afh/ledger