Fix exporting of a redirect. The view method in the Redirect sets

a HTTP header and returns "1", which doesn't create a redirect.

I fixed this by:

- Writing a exportHtml_view method just for Redirect.
- using the Fail Safe style template to output an empty page
  with a redirect tag in the header.

docs/changelog/7.x.x.txt

@@ -3,6 +3,7 @@
  - fix: Workflow form control edit button won't work. removed.
  - fix: Bug in HttpProxy.pm
  - fix: Storage::Image copy does not create thumbnails
+ - fix: Static export - redirect problems
 
 7.2.1
  - Made a change to version tag commits to deal with unusually long commit