* DB integrity: when deleting a build, get rid of its build steps.

Dependencies

• [2] L2E6EVE2 * Merged the Build and Job tables.
• [*] N22GPKYT * Put info about logs / build products in the DB.

Change contents

• edit in src/sql/hydra.sql at line 162
  [2.10820]

  [4.1273]
  + delete from BuildSteps where id = old.id;