Ease understanding the purpose of main fields on alias domains. Set bounce, catchall and default_from available in debug mode as those are advanced configuration bits that should be displayed (and modified) with care. Add tooltips on fields to ease understanding the field usage. Task-3696224 closes odoo/odoo#150401 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>