(request) An option akin to go test's -failfast

[spencerwilson]

In go1.23.3 (and possibly earlier), go test supports a test flag:

	-failfast
	    Do not start new tests after the first test failure.

This flag has no effect when using gocheck as from Go's perspective, a test package contains only one test: a function that calls to gocheck's TestingT func.

I find fail fast helpful to more readably see what test failed. Without it I have to scroll through all the output from the test in order to find the failure. I understand though if it's not a goal of gocheck to reimplement every go test flag there is.