this repository is created by Jenkins (or Hudson), you can setup the format from Jenkins -> Manage Jenkins -> Configure System page.
Once you save it, it will create a hudson.scm.SubversionSCM.xml file with the configuration:
<?xml version='1.0' encoding='UTF-8'?>
<hudson.scm.SubversionSCM_-DescriptorImpl plugin="subve...@1.45">
<generation>1</generation>
<credentials class="hashtable"/>
<workspaceFormat>100</workspaceFormat>
<validateRemoteUpToVar>false</validateRemoteUpToVar>
<storeAuthToDisk>true</storeAuthToDisk>
</hudson.scm.SubversionSCM_-DescriptorImpl>
(WorkspaceFormat at 100, is the one used on SVN 1.7)
If you already created the job, just do a Cleanup Workspace inside the job and it will delete the current one and do a fresh checkout.
Hope this helps.
ps. Kudos for the pull request!! I've accepted the merge.