Remove useless var and update instructions

src/js/HuesEditor.js

@@ -643,8 +643,6 @@ HuesEditor.prototype.uiCreateEditArea = function() {
         <br />\
          [DOUBLE] doubles the selected map length by padding it with "."s.<br />\
          [HALVE] shortens the map length by removing every other character.<br />\
-         [<< START] starts the song from the beginning.<br />\
-         [< LOOP] starts the song from the start of the loop.<br />\
         <br />\
          You can also add a buildup with [LOAD BUILDUP], or remove it<br />\
          with [REMOVE].<br />\

src/js/ResourcePack.js

@@ -417,10 +417,6 @@ Respack.prototype.parseSongFile = function(text) {
 
             song.startSilence = el.getTag("startSilence");
             song.endSilence = el.getTag("endSilence");
-            song.buildupLength = el.getTag("buildupLength");
-            if(song.buildupLength) {
-                debug("Using custom BU length:", song.buildupLength);
-            }
             song.buildupName = el.getTag("buildup");
             if(song.buildupName) {
                 debug("  Finding a buildup '" + song.buildupName + "' for ", song.name);