Dataframe (#576)

* 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

client/src/components/categorical/value.js

@@ -65,7 +65,11 @@ class CategoryValue extends React.Component {
       })[0].categories;
     }
 
-    if (colorAccessor && !isColorBy) {
+    if (
+      colorAccessor &&
+      !isColorBy &&
+      categoricalSelectionState[colorAccessor]
+    ) {
       occupancy = countCategoryValues2D(
         metadataField,
         colorAccessor,