Prototype helper

[richfitz]

This PR adds a prototype helper for bridging between orderly1 and orderly2; it requires merging vimc/orderly#327 and unpinning the branch (684460f) before merge. You must uninstall orderly before trying this out.

The idea is that we construct a little temporary package that imports, then reexports, all the functionality in the target package. There's a little check function to make sure that nothing too terrible happens with versions.

Once installed and run, then orderly::orderly_run will point at whatever version the user has requested - see the readme for details.

While this depends on the orderly1 rename, it can be reviewed before that winds to its eventual end

[codecov]

Codecov Report

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[r-ash]

This is really quite nice in the end!

[r-ash]

Agh sorry I merged this before branch unpinning!