- move 'OERP.report' method to a 'report' service/attribute as 'db',
    with a custom method 'download' which will be a wrapper around the
    'report' and 'report_get' methods?

- service 'OERP.modules':
    - install(module):
            oerp.get('ir.module.module').button_install([192]) # Module 'purchase'
            oerp.get('base.upgrade.module').upgrade_module([])
        Or, since v6.1:
            oerp.get('ir.module.module').button_immediate_install([192])
    - remove(module)
    - upgrade(module)
    - update()
