Half-orm

BREAKING CHANGE

From version 0.12 onward, the *`Relation.__len__`* method has been deprecated.
It is replaced by the `Relation.ho_count` method.

*The code `len(Person())` must be replaced by `Person().ho_count()`*.

> The problem was that the Python builtin function `list` triggers the `__len__` method if it exists. So the
> code `list(Person())` was triggering two requests on the database : frist a SQL `select count`
> and then the SQL `select`.


* [hop] Remove git diff from dummy_test.sh (c8e3bd8)
* Add requirements-dev.txt (1047292)
* Code cleanup. (89fc6da)
* [relation_factory] deprecated decorator has been moved to utils module. (37f25ef)
* [relation][BREAKING CHANGE] ho_count replaces __len__. (a7742af)
* [test] Remove duplicate test. (9440c19)
* Code clean-up (13f4be6)
* Remove examples directory. (a4bf44b)
* [relation] Fix wrong order of foreign key fields in relation representation. (c8abf92)
* [test] Coverage. (7b055b2)
* [fkeys] Detect loops in foreign key settings. (50068fa)

* [hop] Add field and foreign key declarations to allow autocompletion in IDEs. (cb5738c)
* Bump zipp from 3.18.1 to 3.19.1 (012d4ce)
* Bump certifi from 2024.2.2 to 2024.7.4 (5222b58)
* [readme] Add sql injection warning for the Model.execute_query method. (d729ead)

BREAKING CHANGE

The `ho_join` methode has been removed. Use foreign keys instead. The old code (see README):

python
lagaffe = Person(last_name='Lagaffe')
res = lagaffe.ho_join(
(Comment(), 'comments', ['id', 'post_id']),
(Post(), 'posts', 'id')
)


becomes:

python
res = []
lagaffe = Person(last_name='Lagaffe')
for idx, pers in enumerate(lagaffe):
res.append(pers)
res[idx] = {}
posts = Person(**pers).post_rfk()
res[idx]['posts'] = list(posts.ho_select('id'))
res[idx]['comments'] = list(posts.comment_rfk().ho_select('id', 'post_id'))



* [README] Use of pepy.tech for download badge. (2764dc2)
* [README] ... (6188323)
* [README] Update links on badges. (e7a0ba2)
* --- updated-dependencies: - dependency-name: requests dependency-type: indirect ... (ef93b05)
* Update README.md (219f194)
* Python 3.6 is not supported by github actions/setup-pythonv5. Stop testing on github. Python 3.6 is tested on Gitlab. (3552ec3)
* [info] Python 3.6 is supported. (53a3d79)
* Update license. (c2b28e6)
* [doc] Why half_orm. (d4fb6b2)
* [relation][BREAKING CHANGE] Remove ho_join. See README.md. (76d44b1)

* [hop] now generates the ho_dataclasses module containing a dataclass for each relation/view in the model. (57b0e84)

* [relation] Check that the value is valid for ho_limit an ho_offset methods. (cdc6e9b)

* [hop] Remove last reference to half-orm-packager in Pipfile template. (11b79a0)