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Added some retro compatibility code while I'm not super fan of it.

This is related to this commit in YAMS
open-source/yams@c61e1c0e4b49

closes #5

This will allow to add rewriting rules to dispatch url without
cubicweb.web.views.urlrewrite.

Before this commit, doing:

    stuff = dict_protocol_catcher(entity)
    not_in_entity in stuff

Would break because since __contains__ doesn't exist, __getitem__ is called
instead and fails with a KeyError.

- forge dependancies are now installed at first, therefore they will not be
  upgraded by the next requirements (no need to upgrade or force installation).
- simply use the zip archive, provided by the forge. No need to install
  hg-evolve.

"has_permission" route predicate was added in previous patch,
in this patch, we reuse most of the route predicate to create
a view predicate.

This will allow to define several views for a single route, but
with different features depending on the user permissions.

For instance, if the user have the right to edit the entity,
we can add a little box with edition options.

pyfilereader was an old alias for SchemaLoader. Let's remove it. (it has been
removed from yams)

test_chmod used to check that permission are 644, but this is not what is done
in the `process_resource` method. This function sets the permissions to the same
as the source file.

As a consequence, depending on your configuration (default umask for instance),
you may end up with the expected 644 permissions or… something else. (666 on our
gitlab-runner for instance).

To make the test consistent with what is done in the function, and consistent
with the initial purpose of this test [0], let's simply check that the
permissions of the source file and the compiled file are the same.

If it appears that this is not enough, a solution could be to enforce 644
permissions in the `process_resource` method, or give the expected permissions
through parameters.

[0]: https://www.cubicweb.org/ticket/17143773

see: https://github.com/mgedmin/check-manifest/issues/115#issuecomment-625096256

related: #1