XXX: enable coding style on base and simulate a broken bt definition

to confirm that this test would catch these kind of problems.
5 jobs for feat/coding_style_rebuild_bt in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-TestRunner1

00:47:24

passed ERP5.PerformanceTest-TestRunner1

00:32:19

failed ERP5.UnitTest-TestRunner1

01:29:28

failed ERP5.CodingStyleTest-TestRunner1

01:08:19

canceled ERP5.CodingStyleTest-TestRunner1