[AnyEntity] rename __linkto attribute as cw_linkto to avoid name mangling which make overriding/monkey-patching unnecessarily harder

[sql generation test] avoid lgdb warnings when a db module is faked

backport stable

[c-c create] unification of c-c create and its subcommands handling * create/db-create/db-init uniformly accept --automatic and --config-level options, properly passed along the way * --automatic option fixed so it doesn't need yes or no argument * closes ##1537265 on the way