Remove unused store and CWA client code

The two functions that add chapters share one insert. Nothing used
Store.current_revisions and CwaClient.check.

tests/test_store.py

@@ -10,9 +10,11 @@ def test_chapters_revisions_and_rules(tmp_path):
     assert [c["url"] for c in store.chapters_for_build(sid)] == ["u2", "u1"]
 
     assert store.add_revision(c1, "<p>1b</p>", "h1b", "recheck") == 2
-    assert store.current_revisions(sid)[c1] == {"rev": 2, "text_hash": "h1b", "source": "recheck"}
+    newest = store.list_revisions(c1)[-1]
+    assert (newest["rev"], newest["text_hash"], newest["source"]) == (2, "h1b", "recheck")
+    assert store.get_chapter(c1)["current_rev"] == 2
     store.replace_revision(c1, 2, "<p>1c</p>", "h1c")
-    assert store.current_revisions(sid)[c1]["text_hash"] == "h1c"
+    assert store.list_revisions(c1)[-1]["text_hash"] == "h1c"
     assert store.revision_html(c1, 1) == "<p>1</p>"
     store.update_chapter(c1, current_rev=1, included=0)
     assert [c["url"] for c in store.chapters_for_build(sid)] == ["u2"]