clean up the ProgressMeter code, create a specific class if a Term

is around.
start using stuff from termcap, specifically, cleareol, and move to hp.
use the full line when we can, cram 100% if we can.
(this should flicker much less on slow terminals).

clean-up the install-and-progress bits to be in progressmeter, this removes
some code.

have pkg_create follow the same pattern as the others, with a state.
This allows us to unify error messages a bit.

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