Refactor Days tests into those with and without DB setup need.

[plomtask] / templates / calendar.html

{% extends 'base.html' %}

{% block content %}
<ul>
{% for day in days %}
<li><a href="day?date={{day.date}}">{{day.date}}</a> ({{day.weekday}})
{% endfor %}
</ul>
{% endblock %}