[artifetch] Better handle Ctrl-C during fuzzy selection

Do not add on an extra .gz to cache filenames

Choose artifacts by default, and handle non-gzipped text

[artifetch] Dump refactoring

[artifetch] painted black

[artifetch] be more accurate in --json help

[artifetch] Start to clean up the historical mess of command-line options and different ways of selecting things

[artifetch] Expand options for matching jobs

Switch back to the stuff I am using

Are you pondering what I'm pondering?

[artifetch] Seemingly functional record/replay setup. Some wrinkles, but it seems usable for testing.

[artifetch] whip into shape for testing

[artifetch] implement push-header, add a default header for files output

Stuff that should not be committed. oops.

[artifetch] apply history to pushes as well as jobs

[artifetch] implement useful-ish default behavior, and fuzzy job selection, and --again

[artifetach] first attempt at some test harnessing

[artifetch] lookup repository for real

[artifetch] objectify "cache"

[hgrc] Restore the "unified" path