Refactor jupyenv

[GTrunSec]

fixes: #485 #484 #497 #525 #482 #477 #478 #479 #388 #371 #328 #284 #527

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[GTrunSec]

@balsoft refactor-stage1 has been DONE.

[teto]

I've tried to set extraHaskellPackages = p: [ p.bytestring p.text ] for the haskell kernel but if fails because those are null in nixpkgs and the option expects a function towards a list of packages

        extraHaskellPackages = lib.mkOption {
          type = types.functionTo (types.listOf types.package);
          default = _: [];

I think it would be less surprising to have

        extraHaskellPackages = lib.mkOption {
          type = types.functionTo (types.listOf (types.nullOr types.package));
          default = _: [];

[GTrunSec]

@teto Thanks, fixed

[aniinbkln]

@GTrunSec , just wondering what work needs to be wrapped up here to push these changes. Is it just the failing haskell test that is blocking? I would love to help!

[GTrunSec]

@aniinbkln the building of Haskell is ok, just no maintainer(with the PR permission) in this project.

[cschar]

mac m1 user awaiting fix ;)