Better focus management

[markus-walther]

When navigating to a new day, users doing batch data entry expect focus to be on the first unfilled input field.

Implement this.

Debatable: Tab order currently includes delete action buttons. Arguably they are rare. Maybe they should be skipped in tabbing?

[danyball]

There is no input field in which we can set the focus. And focussing the + could be a problem if you switch between days.

[markus-walther]

This is not fixed correctly. The description said first unfilled field. This does not happen in all cases.