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* `ofx` script now implements different commands. Where one called "ofx"
before, now call "ofx query".
* Added new command "ofx download-all", which loads the accounts from a JSON
file (~/Documents/Financial/accounts.json) and downloads transactions for
the accounts listed in that file.
* Added command "record-document-hashes" for e-mailing record of the
hashes of each document.