Code cleanup

-Replace tabs with double-spaces
-Betting spacing and lining up of code functions
-Add missing semi-colons
-Remove extra characters and spaces where applicable
-Remove commented-out code fragments
-Add missing 2021 date to LICENSE
-Small touchups and other misc nitpickings

test/explorerSpec.js

@@ -68,6 +68,7 @@ describe('explorer', function() {
 
   describe('prepare_vout', function() {
     var originalTimeout;
+
     beforeEach(function() {
       originalTimeout = jasmine.DEFAULT_TIMEOUT_INTERVAL;
       jasmine.DEFAULT_TIMEOUT_INTERVAL = 10000;