Add PageUp and PageDown to hotkeys, Target-first sorting for lesion table

Packages/lesiontracker/client/components/lesionTable/lesionTable.js

@@ -1,7 +1,9 @@
 Template.lesionTable.helpers({
     'measurement': function() {
+        // All Targets shall be listed first followed by Non-Targets
         return Measurements.find({}, {
             sort: {
+                isTarget: -1,
                 lesionNumberAbsolute: 1
             }
         });