model/duty: add column to sort shifts by time
gitignore: ignore webassets output
model/user: fix wrong backref
views/profile: group profileviews by url
views/profile: add dummy-views for addresses and mailaddresses of a user
model/user-address: add column to mark main address of a user
model/user-mail: rename column 'main_address' -> 'main'
templates/: use url_for instead relative urls for static files