Accept two missing letters in object keys (but don't use them yet)

Also:

- 'T' doesn't come after 'X' (but does probably appear disproportionally
  in existing object keys)

This commit has been brought to you by the letters 'L' and 'Y'.

chrome/content/zotero/xpcom/data/creator.js

@@ -536,8 +536,7 @@ Zotero.Creator.prototype._checkValue = function (field, value) {
 			break;
 			
 		case 'key':
-			var re = /^[23456789ABCDEFGHIJKMNPQRSTUVWXTZ]{8}$/
-			if (!re.test(value)) {
+			if (!Zotero.ID.isValidKey(value)) {
 				this._invalidValueError(field, value);
 			}
 			break;

chrome/content/zotero/xpcom/id.js

@@ -87,11 +87,18 @@ Zotero.ID_Tracker = function () {
 	
 	
 	function getKey() {
-		var baseString = "23456789ABCDEFGHIJKMNPQRSTUVWXTZ";
+		// TODO: add 'L' and 'Y' after 3.0.11 cut-off
+		var baseString = "23456789ABCDEFGHIJKMNPQRSTUVWXZ";
 		return Zotero.randomString(8, baseString);
 	}
 	
 	
+	this.isValidKey = function () {
+		var re = /^[23456789ABCDEFGHIJKLMNPQRSTUVWXYZ]{8}$/
+		return re.test(value);
+	}
+	
+	
 	function getBigInt(max) {
 		if (!max) {
 			max = 9007199254740991;

chrome/content/zotero/xpcom/utilities.js

@@ -1069,7 +1069,7 @@ Zotero.Utilities = {
 	 **/
 	"randomString":function(len, chars) {
 		if (!chars) {
-			chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
+			chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghiklmnopqrstuvwxyz";
 		}
 		if (!len) {
 			len = 8;