[IMP] Performance: by-pass call to _apply_ir_rules for user admin
[IMP] Batch for the computation of function's stored values is now customizable
[FIX] orm: cleaner batch number of records for auto_init() stored fields.function update
[FIX] orm: cleaner batch number of records for auto_init() stored fields.function update
[FIX] orm: early return within ``_apply_ir_rules`` for superuser.

  Save a few time by not not trying to apply ir.rule for superuser, that will
  anyway be skipped within ir.rule's ``_compute_domain`` method.
[FIX] orm: early return within ``_apply_ir_rules`` for superuser.

  Save a few time by not not trying to apply ir.rule for superuser, that will
  anyway be skipped within ir.rule's ``_compute_domain`` method.