[MlMt] CardDAV multi address book support?

[Mike Brasch]

Moin moin Benny,

the CardDAV server at Fastmail supports multiple address books per 
account. Alongside the "Default" adress book I want to use another one 
for my job. While it is not accessible via OSX adressbook and Fastmail 
web-frontend, it is via BusyContacts on OSX and via CardDAV-Adapter/DW 
Contacts on Android.

It would be nice if MM could lookup for addresses in all address books 
and not only in "Default".

-- 
Gruß
Mike