Merge branch 'ap/remote-hg-unquote-cquote' into maint

A fast-import stream expresses a pathname with funny characters by
quoting them in C style; remote-hg remote helper (in contrib/)
forgot to unquote such a path.

* ap/remote-hg-unquote-cquote:
  remote-hg: unquote C-style paths when exporting

contrib/remote-helpers/git-remote-hg

@@ -678,6 +678,11 @@ def get_merge_files(repo, p1, p2, files):
             f = { 'ctx' : repo[p1][e] }
             files[e] = f
 
+def c_style_unescape(string):
+    if string[0] == string[-1] == '"':
+        return string.decode('string-escape')[1:-1]
+    return string
+
 def parse_commit(parser):
     global marks, blob_marks, parsed_refs
     global mode
@@ -720,6 +725,7 @@ def parse_commit(parser):
             f = { 'deleted' : True }
         else:
             die('Unknown file command: %s' % line)
+        path = c_style_unescape(path).decode('utf-8')
         files[path] = f
 
     # only export the commits if we are on an internal proxy repo