111.08.00

- Fix a hang.

    Jenga could reach a state with a non-zero todo-count, but have no
    jobs actually running, and then hang in this state forever. The hang
    would be evident from a progress line with not all targets built and
    with `j=0+0` such as:

        todo: 17 (100406 / 100423) j=0+0 con=149956 act=3303, finish at: 16:20