[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

     1

TACHES

     2

======

     3

     4

-- écrire objet stocke/manipule les données

     5

     6

-- extraire tests de chaîne de caractère

     7

     8

* utiliser sqlite 

     9

    10

* écrire fonction prend chemin en argument et renvoie contenu

    11

    12

* extraire tests (chaîne de caractère) de spec 

    13

    14

* utiliser yams pour schéma