cubicweb #344861 rtags don't consider yams inheritance [waiting feedback]

for instance, if CodeKeyword inherits from Keyword

uicfg.actionbox_appearsin_addmenu.tag_object_of(('Keyword', 'subkeyword_of', 'Keyword'), True)

should imply

uicfg.actionbox_appearsin_addmenu.tag_object_of(('CodeKeyword', 'subkeyword_of', 'CodeKeyword'), True)
prioritynormal
typebug
done in<not specified>
load0.300
load left0.300
closed by<not specified>