ENH: add buttons for server node

Libs/DICOM/Widgets/Resources/UI/ctkDICOMServerNodeWidget.ui

@@ -32,7 +32,7 @@
         <x>0</x>
         <y>0</y>
         <width>572</width>
-        <height>458</height>
+        <height>394</height>
        </rect>
       </property>
       <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -64,6 +64,32 @@
      </widget>
     </widget>
    </item>
+   <item>
+    <widget class="QFrame" name="frame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QPushButton" name="removeButton">
+        <property name="text">
+         <string>Add</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="addButton">
+        <property name="text">
+         <string>Remove</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>