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

Packages/viewerbase/lib/enableHotkeys.js

@@ -12,8 +12,8 @@ Meteor.startup(function() {
         stackScroll: "S",
         pan: "P",
         magnify: "M",
-        scrollDown: "DOWN",
-        scrollUp: "UP",
+        scrollDown: ["DOWN", "PAGEDOWN"],
+        scrollUp: ["UP", "PAGEUP"],
         nextPanel: "RIGHT",
         previousPanel: "LEFT",
         invert: "I",