Added signature file selection.

grendel/prefs/PrefDialogs.xml

@@ -30,6 +30,19 @@
     <input type="text" ID="userEmailAddressField" value="userEmailAddressField"
      weightx="1" fill="horizontal" gridwidth="remainder"
      insets="[0,5,5,5]"/>
+
+    <label title="$mailDirectoryLabel"
+     weightx="1" fill="horizontal" gridwidth="remainder"
+     insets="[5,5,0,5]"/>
+
+    <input type="text" ID="mailDirectoryField" value="mailDirectoryField"
+     weightx="1" fill="horizontal" gridwidth="relative" columns="10"
+     insets="[0,5,5,5]"/>
+
+    <input type="button" ID="chooseButton" command="chooseButton"
+     title="$chooseLabel"
+     weightx="1" fill="horizontal" gridwidth="remainder"
+     insets="[0,0,5,5]"/>
   </panel>
 </dialog>