When one looks back, the enormity of Emma Osment's achievements sinks in. There in the dusk, high on a hill in a blaze of light, stands a house of which a princess would be proud. Its lines are modern classic: high, sleek gables ; massive windows; oiled Judging by the number of people streaming in and out of a home in south Langley on a recent visit, quite a few folks have a secret desire to be