Disable options that are not yet implemented

The export and send options will be done in the future, but for
now there is usable functionality so we'll just reserve these spots.

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

@@ -151,11 +151,14 @@
    </property>
   </action>
   <action name="actionExport">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
    <property name="text">
     <string>Export</string>
    </property>
    <property name="toolTip">
-    <string>Export selected study/series to a DICOM folder</string>
+    <string>Export selected study/series to a DICOM folder (not yet available)</string>
    </property>
   </action>
   <action name="actionQuery">
@@ -167,11 +170,14 @@
    </property>
   </action>
   <action name="actionSend">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
    <property name="text">
     <string>Send</string>
    </property>
    <property name="toolTip">
-    <string>Send DICOM Studies to a DICOM node</string>
+    <string>Send DICOM Studies to a DICOM node (not yet available)</string>
    </property>
   </action>
  </widget>