Add shift_1_pairs and shift_1 (in fibtools.py, with tests).
Add slide_1_pairs and slide_1 (in fibtools.py, with tests).
Add shuffle(i, j) to fibtools.py, with tests.
Add slide(shape_data) to fibtools.py, with tests.
Add compute(shape_data) to fibtools.py, with tests. (TODO: Check expected values.)