New version which provides a fullbackup script
Moved link to edit form of address book from tabs to master data.

+ Refactored some tests to be unittests instead of doctests.
+ Moved code a bit around.

--HG--
rename : src/icemac/addressbook/browser/addressbook/edit.py => src/icemac/addressbook/browser/addressbook/crud.py
rename : src/icemac/addressbook/browser/addressbook/list.pt => src/icemac/addressbook/browser/person/list.pt
rename : src/icemac/addressbook/browser/addressbook/list.py => src/icemac/addressbook/browser/person/list.py