bug: `getBounds` and `getBounds2` in `FitRecipe` both return defaults even when bounds are set

[cadenmyers13]

Problem

When trying to write a test for getBounds and getBounds2 they both return [-inf, inf] even when they are bounded,

def test_getBounds():
    recipe = FitRecipe("recipe")
    recipe.create_new_variable("var1", 1)
    recipe.restrain("var1", lb=-1, ub=1)
    actual_bounds = recipe.getBounds()
    expected_bounds = [(-1, 1)]
    assert actual_bounds == expected_bounds

def test_getBounds2():
    recipe = FitRecipe("recipe")
    recipe.create_new_variable("var1", 1)
    recipe.create_new_variable("var2", 2)
    recipe.restrain("var1", lb=0, ub=5)
    recipe.restrain("var2", lb=-1, ub=3)
    actual_lower_bounds, actual_upper_bounds = recipe.getBounds2()
    expected_lower_bounds = [0, -1]
    expected_upper_bounds = [5, 3]
    assert list(actual_lower_bounds) == expected_lower_bounds
    assert list(actual_upper_bounds) == expected_upper_bounds

FAILED tests/test_fitrecipe.py::test_getBounds - assert [[-inf, inf]] == [(-1, 1)]
FAILED tests/test_fitrecipe.py::test_getBounds2 - assert [np.float64(-...float64(-inf)] == [0, -1]

Proposed solution

1. Implement the above two tests and fix the code to get it passing.
2. These functions are going to be deprecated so make sure we are testing both the new and deprecated ones

[sbillinge]

haha, this is why we love tests....