Enabled term construction for all numerical comparison operators

[kiranandcode]

Closes #446

def test_arithmetic_6():
    assert isinstance(defop(int)() > 1, Term)
    assert isinstance(defop(int)() < 1, Term)
    assert isinstance(defop(int)() >= 1, Term)
    assert isinstance(defop(int)() <= 1, Term)

Fix was to remove uses of @functools.total_ordering and instead define all comparisons manually.