paypro: store total on merchant data specifically for display purposes.
paypro: reimplement `merchant` field in uri parser.
hdpath: fix uri parser to deal with merchant uris.
paypro: use bignum for totals.
paypro: fix total on merchantdata.
paypro: allow payment protocol addresses in address input.
paypro: parse bitcoin uri. show merchant uri properly.
paypro: messy work to get xhr to payment server working.
paypro: remove old parse uri code. more debugging.
paypro: more messy debugging.
paypro: more debugging.