It would be great to have a "Use Export" option on the Subversion configuration
section of a job, similar to the current "Use Update" option.
This greatly speeds up the checkout time for a build.

The feature is applicable when:
1. Your project does not have a reliable clean or rebuild setup, or you
absolutely want to start with a clean workspace for every build.
2. You project does not expect to perform any working copy subversion
operations as part of the build.

We made a quick hack to test the approach by changing the source to use
"checkout" for only the root module directory (no recursion), and then "export"
the module with full recursion. The change dropped our checkout time from 31 to
11 minutes. The approach we coded was not very clean. It would probably be
better to run only the "export" command and use the returned revision number to
obtain the necessary SVNInfo object from the server instead of the working copy
(for change log and tagging purposes).