Test coverage for schooltool.person

schooltool/      covered 72% (7525 of 27762 uncovered)
    person/      covered 92% (58 of 747 uncovered)
        browser/      covered 87% (47 of 387 uncovered)
        person.py      covered 93% (7 of 101 uncovered)
        preference.py      covered 90% (3 of 31 uncovered)
        sampledata.py      covered 99% (1 of 102 uncovered)
        __init__.py      covered 100% (0 of 15 uncovered)
        ftesting.py      covered 100% (0 of 8 uncovered)
        interfaces.py      covered 100% (0 of 83 uncovered)
        utility.py      covered 100% (0 of 20 uncovered)