Bug 220894: Add UI for automatic emptying of trash for local folders on exit

r=bienvenu, sr=mscott

mailnews/base/prefs/resources/content/am-serverwithnoidentities.xul

@@ -20,14 +20,28 @@
              prefstring="mail.server.%serverkey%.name"/>
   </hbox>
 
-  <separator/>
+  <separator class="thin"/>
 
-  <label value="&localPath.label;" control="server.localPath"
-         accesskey="&localPath.accesskey;"/>
-  <hbox align="center">
-    <textbox readonly="true" wsm_persist="true" flex="1" id="server.localPath" datatype="nsIFileSpec"
-             prefstring="mail.server.%serverkey%.directory" class="uri-element"/>
-    <button id="browseForLocalFolder" label="&browseFolder.label;" filepickertitle="&localFolderPicker.label;"
-            accesskey="&browseFolder.accesskey;" oncommand="BrowseForLocalFolders()"/>
-  </hbox>
+  <groupbox>
+    <caption label="&messageStorage.label;"/>
+
+    <vbox align="start">
+      <checkbox wsm_persist="true" id="server.emptyTrashOnExit"
+                label="&emptyTrashOnExit.label;"
+                accesskey="&emptyTrashOnExit.accesskey;"
+                prefattribute="value"
+                prefstring="mail.server.%serverkey%.empty_trash_on_exit"/>
+    </vbox>
+
+    <separator class="thin"/>
+
+    <label value="&localPath.label;" control="server.localPath"
+           accesskey="&localPath.accesskey;"/>
+    <hbox align="center">
+      <textbox readonly="true" wsm_persist="true" flex="1" id="server.localPath" datatype="nsIFileSpec"
+               prefstring="mail.server.%serverkey%.directory" class="uri-element"/>
+      <button id="browseForLocalFolder" label="&browseFolder.label;" filepickertitle="&localFolderPicker.label;"
+              accesskey="&browseFolder.accesskey;" oncommand="BrowseForLocalFolders()"/>
+    </hbox>
+  </groupbox>
 </page>

mailnews/base/prefs/resources/locale/en-US/am-serverwithnoidentities.dtd

@@ -1,9 +0,0 @@
-<!ENTITY accountTitle.label "Account Settings">
-<!ENTITY accountSettingsDesc.label "The following is a special account.  There are no identities associated with it.">
-<!ENTITY accountName.label "Account Name:">
-<!ENTITY accountName.accesskey "N">
-<!ENTITY localPath.label "Local directory:">
-<!ENTITY localPath.accesskey "L">
-<!ENTITY localFolderPicker.label "Select Local Directory">
-<!ENTITY browseFolder.label "Browse...">
-<!ENTITY browseFolder.accesskey "B">