Test coverage for schooltool.person

schooltool/      covered 77% (4766 of 21338 uncovered)
    person/      covered 92% (47 of 625 uncovered)
        browser/      covered 89% (38 of 372 uncovered)
        person.py      covered 94% (6 of 104 uncovered)
        preference.py      covered 90% (3 of 31 uncovered)
        __init__.py      covered 100% (0 of 15 uncovered)
        help/      covered 100% (0 of 0 uncovered)
        interfaces.py      covered 100% (0 of 83 uncovered)
        utility.py      covered 100% (0 of 20 uncovered)