plugin upload, XEP-0363: splitted fileUpload in fileUpload + upload: fileUpload is used by external frontends, while upload can be used by frontends. upload return in addition to the progress_id a download_d Deferred which fire with URI when file is uploaded. changed option ignore-tls-errors to ignore_tls_errors.

Use this module to temporary store files that need to be integrated to other
projects such as Wokkel.

For example, the changeset that introduced this folder adds RSM (XEP-0059)
support to Wokkel. The files in sat.tmp.wokkel are imported over the initial
wokkel files from sat.plugins.__init__.py