add config page for fsck, and alert with button when a fsck is running

templates/configurators/main.hamlet

@@ -13,6 +13,7 @@
       <p>
         Tune the behavior of git-annex, including how many copies #
         to retain of each file, and how much disk space it can use.
+  <div .row-fluid>
     <div .span4>
       $if xmppconfigured
         <h3>
@@ -28,3 +29,10 @@
        <p>
          Keep in touch with remote devices, and with your friends, #
          by configuring a jabber account.
+    <div .span4>
+      <h3>
+        <a href="@{ConfigFsckR}">
+          Configure consistency checks
+      <p>
+        Set up periodic checks of your data to detect and recover from #
+        disk problems.