Dataframe, part deux - add varData and summarize() (#608)

* initial dataframe commit

* initial dataframe port of core app

* rename variables for clarity

* remove unused import

* comment out unused code

* fix array handling bug in crossfilter dimension creation

* allow creation of empty dataframes

* handle non-existent columns

* handle non-existent columns

* revise tests for new dataframe

* comments for clarity

* comments for clarity

* generate bulk add placeholder with real gene names

* fix bug in gene name adding

* more dataframe unit tests

* fix bug - subset from current world, not universe

* put cut and pasted code into a single function

* improve caching of crossfilter

* remove cascading update bug from graph

* more performance work

* improve state handling for scatterplot

* performance optimization of critical path

* add column summarization

* dataframe utils

* add callOnceLazy

* fix tests

* minor updates found during review

* fix misspelling

* remove RESTv02 from function names

* comment cleanup

* cut/icut col parameter defaults to null

* break up large test

* improve tests and comments on dataframe at/has functions

* add Dataframe withCol/dropCol

* expression varData now stored in a dataframe

* dead code cleanup

* use dataframe.summarize()

* test cases for Dataframe.col.summarize

* update test cases for new dataframe summarize

* improve naming

* use new hasCol API

* add comments

* add more Dataframe.withCol tests

* add ability to specify row index in cut operation

* retire subsetVarData function

* correctly handle expression subsetting

* lint and improve comments

* rename cut to subset

* changes based on PR review

client/__tests__/util/stateManager/universe.test.js

@@ -41,15 +41,13 @@ describe("createUniverseFromResponse", () => {
     expect(universe).toBeDefined();
     expect(universe).toMatchObject(
       expect.objectContaining({
-        api: "0.2",
         nObs,
         nVar,
         schema: REST.schema.schema,
         obsAnnotations: expect.any(Dataframe.Dataframe),
         varAnnotations: expect.any(Dataframe.Dataframe),
         obsLayout: expect.any(Dataframe.Dataframe),
-        summary: expect.any(Object),
-        varDataCache: expect.any(Object)
+        varData: expect.any(Dataframe.Dataframe)
       })
     );
 
@@ -63,5 +61,6 @@ describe("createUniverseFromResponse", () => {
       nVar,
       REST.schema.schema.annotations.var.length
     ]);
+    expect(universe.varData.isEmpty()).toBeTruthy();
   });
 });