- Closes #1793, Add update button to standalone

A "Check for Updates" menu item is now available (under the Zotero menu on OS X, or the Help menu on other platforms). This will currently give a 404 unless you build Zotero Standalone as from the "beta" channel.

- Don't add About menu option to help menu on OS X (only to Zotero menu)

chrome/content/zotero-platform/mac/standalone/menuOverlay.xul

@@ -81,10 +81,6 @@
 
 	<!-- nsMenuBarX hides these and uses them to build the Application menu. -->
     <menupopup id="menu_FilePopup">
-		<menuitem id="aboutName"
-				accesskey="&aboutProduct.accesskey;"
-				label="&aboutProduct.label;"
-				oncommand="ZoteroPane.openAboutDialog();"/>
         <menuitem id="menu_preferences"
 				label="&preferencesCmdMac.label;"
 				key="key_preferencesCmdMac"

chrome/content/zotero/standalone/standalone.js

@@ -138,6 +138,13 @@ var ZoteroStandalone = new function()
 		}
 	}
 	
+	/**
+	 * Checks for updates
+	 */
+	this.checkForUpdates = function() {
+		window.open('chrome://mozapps/content/update/updates.xul', 'updateChecker', 'chrome,centerscreen');
+	}
+	
 	/**
 	 * Called before standalone window is closed
 	 */

chrome/content/zotero/standalone/standalone.xul

@@ -198,6 +198,10 @@
 									  accesskey="&helpReportErrors.accesskey;"
 									  label="&helpReportErrors.label;"
 									  command="cmd_zotero_reportErrors"/>
+							<menuitem id="checkForUpdates"
+									  accesskey="&helpCheckForUpdates.accesskey;"
+									  label="&helpCheckForUpdates.label;"
+									  oncommand="ZoteroStandalone.checkForUpdates();"/>
 							<menuitem id="aboutName"
 									  accesskey="&aboutProduct.accesskey;"
 									  label="&aboutProduct.label;"