Add default access level support

[johnmckerrell]

We have need for mutually exclusive access levels. MD will need to access the front door but nothing else, whereas most DoES members can probably have access to all internal doors but not the main door (and then others will need access to all).

[johnmckerrell]

Actually this is quite doable now, we assign shutter access level to MD and then set doorbot4 and doorbot5 to be access levels shutter and full, the only reason we're not really using it is that to do so would require setting an access level for everyone who needs to use the main door. The proper fix for that is to allow everyone at DoES to come in that door during business hours and maker night/day.