add git fsck to cronner, and UI for repository repair (not yet wired up)

templates/control/repairrepository.hamlet

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+<div .span9 .hero-unit>
+  <p>
+    A periodic #
+    <a href="@{ConfigFsckR}">
+      consistency check #
+    found corrupt data in the git repository #{repodesc}.
+  <p>
+    While this is not good, this problem can be automatically repaired,
+    often without data loss.
+  <p>
+    When possible, the corrupt data will be recovered from other #
+    repositories. You should make sure any other repositories #
+    are available before continuing. Ie, plug in any removable drive #
+    that contains a repository, or make sure your network connection #
+    to other repositories is active.
+  <p>
+    <a .btn .btn-primary href="@{RepairRepositoryRunR u}" onclick="$('#workingmodal').modal('show');">
+      Start Repair Process
+<div .modal .fade #workingmodal>
+  <div .modal-header>
+    <h3>
+      Repairing #{repodesc} ...
+  <div .modal-body>
+    <p>
+      This may take some time.

templates/control/repairrepository/run.hamlet

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+<div .span9 .hero-unit>
+  <p>
+    TODO