boda: help tweaks.

-- help ignores arguments *after* help now (rather than ignore args before the help option)
-- boda with no args prints usage and modes now, and is the same as passing just -h / --help
-- bad field names now just print the error(s) they used to throw.
-- add checking of output for a few boda main tests that became non-errors due to the bad-fields-names behavior change
cap_app (mostly): experiments with streams for synchonization of display.