Context

History - what we have

.ocamlformat files were duplicated in the tree because their scope stops at dune-project files.
We have many dune-project files in the tree because that is a condition for having opam files in sub-directories. Dune only know about opam packages living next to dune-project
We didn't want to have hundred of opam files at the root
This forces us to have a dedicated script for pinning, because opam doesn't scan opam files in sub-directories yet.

Move tezos opam files (the ones under the manifest control) into %{root}/opam/*.opam
remove dune-project files that are no longer next to opam files (but at the root)
remove ocamlformat files that are not longer next to a dune-project file
add package to documentation and install dune stanza
no longer try to install non-installable opam packages (because they depend on a library present in vendors only) in opam-trigger.
The dune semantic of vendors forces us to rm vendors before installing any opam packages from the repo. The consequence is that we can no longer install a bunch of opam packages inside opam:trigger (improvement planed in !5157 (merged))

opam pin might take longer, because we need to sync the entire repo for every packages. Previously, we would only sync the relevent part of the repo for a given package. Fix in a followup MR !5252 (merged)

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR

Edited May 10, 2022 by Hugo Heuzard