Graph selection state management and history bug fixes (#679)

* save graph selection in redux state

* fix old graph brush select regressions

* refactor graph brush selection to work with undo/redo

* update tests to match new crossfilter spatial select API

* graph selection state now in redux

* remove dead code

* sync graph selection with redux state; improvements to undoable machinery

* fix regression in undoable

* differentiate graph selection cancel from deselect action

* simplify calculation

* remove debugging code

* fix responsive repaint bug in graph selection tool

* undoable debugging and code cleanliness

* undoable action filter state now merges, rather than replaces

* improve comments

* add debounce to undoable action filter; improve comments and debug sanity check code

* comments

* fix undoable bug with clear scatterplot actions

* disable undoable debug flag

* cleanup API and comments around statemachine

* add test id attribute to lasso

* add better error handling for gene fetch requests

client/src/components/brushableHistogram/index.js

@@ -124,7 +124,7 @@ class HistogramBrush extends React.Component {
           const dX0 = Math.abs(x0 - selection[0]);
           const dX1 = Math.abs(x1 - selection[1]);
           /*
-          only update the brush if it is grossly incorrect, 
+          only update the brush if it is grossly incorrect,
           as defined by the moveDeltaThreshold
           */
           if (dX0 > moveDeltaThreshold || dX1 > moveDeltaThreshold) {
@@ -216,14 +216,13 @@ class HistogramBrush extends React.Component {
         });
       } else {
         dispatch({
-          type: "continuous metadata histogram end",
+          type: "continuous metadata histogram cancel",
           selection: field,
           continuousNamespace: {
             isObs,
             isUserDefined,
             isDiffExp
-          },
-          range: null
+          }
         });
       }
     };