Return the least integer multiple of m greater than or equal to n.
abjad> mathtools.least_multiple_greater_equal(10, 47)
50
abjad> for m in range(1, 10):
... print m, mathtools.least_multiple_greater_equal(m, 47)
...
1 47
2 48
3 48
4 48
5 50
6 48
7 49
8 48
9 54
abjad> for n in range(10, 100, 10):
... print mathtools.least_multiple_greater_equal(7, n), n
...
14 10
21 20
35 30
42 40
56 50
63 60
70 70
84 80
91 90