Merge branch 'ho/dashless' into maint

* ho/dashless: tests: use "git xyzzy" form (t7200 - t9001) tests: use "git xyzzy" form (t7000 - t7199) tests: use "git xyzzy" form (t3600 - t6999) tests: use "git xyzzy" form (t0000 - t3599) 'git foo' program identifies itself without dash in die() messages Start conforming code to "git subcmd" style