Extract files to "/TMPDIR/TOKEN"...TOKEN is the user token
* gn3/file_utils.py (extract_uploaded_file): Add extra param "token". If a
token is empty, create a new directory based off that token.
* tests/unit/test_file_utils.py: Update failing tests.
Add gemma-wrapper...* guix.scm: New package propagated-input.
* README.md: Mention that you require "guix-bioinformatics" package, because
of the addition of "gemma-wrapper".