#87 Make h pop the condition when the loop terminates

[Martin Büttner]

What the title says. Of course, this change would break backwards-compatibility.

I think I almost never want to keep the condition, and when I do, I usually know if it's 0 or "" so I can get it back with a single character. (Or two in the very rare case that the falsy value is 0c.)

The current behaviour of h can be recovered with _}g.