js/segmenter.js: no align button when there is no cgi_address

Moreover, there is no need to duplicate the default address in main.js

browser/js/conf.js.sample

@@ -5,7 +5,9 @@
 
 var config = {
 
-    /* Used for the 'align' script */    
+    /* Used for the 'align' script 
+     * If this is not defined, the 'align' button is not available
+     */    
     "cgi_address" : "http://127.0.1.1/cgi-bin/",
 
     /* The following options control how the user may have access to .vidjil files.

browser/js/main.js

 var DB_ADDRESS = ""
-var CGI_ADDRESS = "http://127.0.1.1/cgi-bin/";
+var CGI_ADDRESS = ""
 
 
 /*tools

browser/js/segmenter.js

@@ -87,6 +87,7 @@ Segment.prototype = {
         div_menu.appendChild(span)
 
         //align button
+        if (this.cgi_address) {
         span = document.createElement('span');
         span.id = "align"
         this.updateAlignmentButton();
@@ -96,7 +97,8 @@ Segment.prototype = {
         }
         span.appendChild(document.createTextNode("align"));
         div_menu.appendChild(span)
-
+        }
+        
         //toIMGT button
         span = document.createElement('span');
         span.id = "toIMGT"