* [ refactor ] moving Data.OpenUnion to base
* [ new ] System.Concurrency.(Linear/Session)
* [ test ] for the new feature
Fixing other tests impacted by the refactoring
* [ cleanup ] move definitions around, touch up docs
* [ fix ] re-export linear notations for Control.Linear.LIO
Thanks to the debug info supplied by #2673, I was able to spot which
functions were blocking and `public import` the relevant files in
`papers/Search/Properties.idr`.
As a result the GCL file now type-checks, albeit extremely slowly!
I stopped an evaluation of `petersonsCorrect` at the REPL after 15
minutes and ~14GB of RAM consumed.
