fix fermi_hubbard/publication_test by updating datadryad download URL…

…s since they appear to have changed (#166)

* add a library containing mcpe calculation utilities, DependencyLists and QubitMapping data structures, and implement the swap update algorithm

* remove iswap factory and replace swap factory with sqrt-iswap decomposition

* fix typo

* replace _adjacent_qubits() with GridQubit.neighbors() and remove SwapUpdateTransformer

* replace assert's with ValueError's, update manhattan distance TODO, and add test coverage for previously untested public functions

* refactor swap updater tests

* update datadryad download URLs since they appear to have changed

recirq/fermi_hubbard/publication.py

@@ -241,10 +241,10 @@ def fetch_publication_data(
 
     base_url = "https://datadryad.org/stash/downloads/file_stream/"
     data = {
-        "gaussians_1u1d_nofloquet": "706210",
-        "gaussians_1u1d": "706211",
-        "trapping_2u2d": "706212",
-        "trapping_3u3d": "706213"
+        "gaussians_1u1d_nofloquet": "451326",
+        "gaussians_1u1d": "451327",
+        "trapping_2u2d": "451328",
+        "trapping_3u3d": "451329"
     }
     if exclude is not None:
         data = {path: key for path, key in data.items() if path not in exclude}