make tic labels optional for bar charts

pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java

@@ -37,6 +37,8 @@ public class PlotRequest {
     private String intervalUnit;
     private int intervalValue;
 
+    private boolean renderBarChartTickLabels;
+
     public String getQuery() {
         return query;
     }
@@ -169,4 +171,12 @@ public class PlotRequest {
     public void setIntervalValue(final int intervalValue) {
         this.intervalValue = intervalValue;
     }
+
+    public boolean isRenderBarChartTickLabels() {
+        return renderBarChartTickLabels;
+    }
+
+    public void setRenderBarChartTickLabels(final boolean renderBarChartTickLabels) {
+        this.renderBarChartTickLabels = renderBarChartTickLabels;
+    }
 }