remove experimental reembedding support (#2301)

* remove experimental reembedding support

* lint

* lint

* add prepare requirements to requirements-dev

* oops, revert accidental deletion of import

* more test modifications

* remove obsolete unit tests

client/src/reducers/index.js

@@ -20,7 +20,6 @@ import genesetsUI from "./genesetsUI";
 import autosave from "./autosave";
 import centroidLabels from "./centroidLabels";
 import pointDialation from "./pointDilation";
-import { reembedController } from "./reembed";
 import { gcMiddleware as annoMatrixGC } from "../annoMatrix";
 
 import undoableConfig from "./undoableConfig";
@@ -42,7 +41,6 @@ const Reducer = undoable(
     ["differential", differential],
     ["centroidLabels", centroidLabels],
     ["pointDilation", pointDialation],
-    ["reembedController", reembedController],
     ["autosave", autosave],
     ["userInfo", userInfo],
   ]),