gene set summary progress (#2127)

* revert removal of cache control headers

* checkpoint work on revising summary route

* add summary query support to annoMatrix

* summarize route cleanup

* add mising file

* clean up summarize route

* add summary histogram

* update deps

* lint

* more lint

* lint

* manage crossfiler during gene set state changes

* remove obsolete debugging code

* correctly perform async watch in histogram

* better error handling

client/src/components/menubar/diffexpButtons.js

@@ -11,7 +11,7 @@ import CellSetButton from "./cellSetButtons";
   celllist1: state.differential?.celllist1,
   celllist2: state.differential?.celllist2,
   diffexpMayBeSlow: state.config?.parameters?.["diffexp-may-be-slow"] ?? false,
-  diffexpCellcountMax: state.config?.limits?.["diffexp_cellcount_max"],
+  diffexpCellcountMax: state.config?.limits?.diffexp_cellcount_max,
 }))
 class DiffexpButtons extends React.PureComponent {
   computeDiffExp = () => {