Add "cluster introducer" functionality to nodes (ref #120)

gui/app.js

@@ -666,7 +666,8 @@ syncthing.controller('SyncthingCtrl', function ($scope, $http, $translate, $loca
     $scope.addNode = function () {
         $scope.currentNode = {
             AddressesStr: 'dynamic',
-            Compression: true
+            Compression: true,
+            Introducer: true
         };
         $scope.editingExisting = false;
         $scope.editingSelf = false;

gui/index.html

@@ -260,6 +260,11 @@
                       <td translate ng-if="nodeCfg.Compression" class="text-right">Yes</td>
                       <td translate ng-if="!nodeCfg.Compression" class="text-right">No</td>
                     </tr>
+                    <tr>
+                      <th><span class="glyphicon glyphicon-thumbs-up"></span>&emsp;<span translate>Introducer</span></th>
+                      <td translate ng-if="nodeCfg.Introducer" class="text-right">Yes</td>
+                      <td translate ng-if="!nodeCfg.Introducer" class="text-right">No</td>
+                    </tr>
                     <tr ng-if="connections[nodeCfg.NodeID]">
                       <th><span class="glyphicon glyphicon-tag"></span>&emsp;<span translate>Version</span></th>
                       <td class="text-right">{{connections[nodeCfg.NodeID].ClientVersion}}</td>
@@ -388,6 +393,15 @@
                 <label>
                   <input type="checkbox" ng-model="currentNode.Compression"> <span translate>Use Compression</span>
                 </label>
+                <p translate class="help-block">Compression is recommended in most setups.</p>
+              </div>
+            </div>
+            <div ng-if="!editingSelf" class="form-group">
+              <div class="checkbox">
+                <label>
+                  <input type="checkbox" ng-model="currentNode.Introducer"> <span translate>Introducer</span>
+                </label>
+                <p translate class="help-block">Any nodes configured on an introducer node will be added to this node as well.</p>
               </div>
             </div>
           </form>

gui/lang/lang-en.json

@@ -8,10 +8,12 @@
    "Allow Anonymous Usage Reporting?": "Allow Anonymous Usage Reporting?",
    "Announce Server": "Announce Server",
    "Anonymous Usage Reporting": "Anonymous Usage Reporting",
+   "Any nodes configured on an introducer node will be added to this node as well.": "Any nodes configured on an introducer node will be added to this node as well.",
    "Bugs": "Bugs",
    "CPU Utilization": "CPU Utilization",
    "Close": "Close",
    "Comment, when used at the start of a line": "Comment, when used at the start of a line",
+   "Compression is recommended in most setups.": "Compression is recommended in most setups.",
    "Connection Error": "Connection Error",
    "Copyright © 2014 Jakob Borg and the following Contributors:": "Copyright © 2014 Jakob Borg and the following Contributors:",
    "Delete": "Delete",
@@ -42,6 +44,7 @@
    "Ignore Patterns": "Ignore Patterns",
    "Ignore Permissions": "Ignore Permissions",
    "Incoming Rate Limit (KiB/s)": "Incoming Rate Limit (KiB/s)",
+   "Introducer": "Introducer",
    "Inversion of the given condition (i.e. do not exclude)": "Inversion of the given condition (i.e. do not exclude)",
    "Keep Versions": "Keep Versions",
    "Last seen": "Last seen",