Pip2nix

=====

- Fix job `docs` in `release.nix` to include the full sources.

- Extend tips in the documentation with trouble related to `nix-prefetch-hg`.

=====

- Update template for the file `default.nix` to also ignore the `.hg` folder.
This is useful for Mercurial based projects.

Thanks to Marcin Kuzminzki.

- Fix to quote package and dependency names and improve the readability of the
generated output.

Thanks to Asko Soukka.

- Adjust `release.nix` for better Hydra integration.

Thanks to Martin Bornhold.

- Mark tests as xfail to avoid trouble when building on NixOS itself.
Details can be found here https://github.com/johbo/pip2nix/issues/35.

- Use `python36Packages` by default inside of `default.nix`. I noticed that I
was specifying it nearly always when working on `pip2nix`. Via `release.nix`
we still have all Python versions easily available.

- Fix the attribute name of ZPL licenses, so that it matches the attribute names
from Nixpkgs_.

- Add an example about `setuptools` into the generated layer with manual
overrides. This is a useful entry when running into issues around an infinite
recursion.

- Update docs with a hint how to run inside of `nix-shell`.

- Update docs with a pointer to examples in `pip2nix-generated`.

- Add section "Tips" to the documentation.

=====

- Change the file `python-packages.nix` into a function.

To adjust import it like the following:

.. code:: nix

pythonPackagesGenerated = import ./python-packages.nix {
inherit pkgs;
inherit (pkgs) fetchurl fetchgit;
};

- Add new attribute `pip2nix.python36` into the file `release.nix`.

- Adjust the template for the file `default.nix` to be compatible with
the new python packages which are based on the fix point combinator.
See https://github.com/NixOS/nixpkgs/pull/20893 for more details.

=====

- Fixes for git URL support, parsing the output of `nix-prefetch-git` as JSON.

- Use `nix-prefetch-url` to fetch dependencies and get their `sha256` hash.

- Allow version 9 of pip itself for better compatibility with recent nixpkgs
versions.

- Update `python-packages.nix` and `release-python-packages.nix`. This should
also avoid the warnings due to using `md5` as a hash type.





.. Links

.. _Nixpkgs: https://nixos.org/nixpkgs