Reinstate the basic sessioning with Products.Sessions#989

Merged

dataflake merged 4 commits intomasterfrom dataflake/reinstate_tempstorage

Oct 14, 2021

+384-509

Commits on Oct 12, 2021

- reinstate the basic sessioning with Products.Sessions
dataflake
committed

Commits on Oct 13, 2021

- both Products.Sessions and Products.TemporaryFolder must be installed [ci skip]
dataflake
committed
- make sure Python versions are consistent
dataflake
committed

Commits on Oct 14, 2021

- remove Python version pin
dataflake
committed