Clean up the code very much, and add new features.

Import modules globally instead of within a method.
Remove importURL and deleteBackupObjects.
Add security declarations into publish, download.
Fix file descriptor leaking and temporary file leaking.
Add manage_download, updateRepositoryBusinessTemplateList,
getRepositoryList, getRepositoryBusinessTemplateList,
getUpdatedRepositoryBusinessTemplateList, and compareVersions.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4674 20353a03-c40f-0410-a6d1-a30d3c3de9de