Icemac-ab-calendar

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- Add new recurrences for recurring events:

* biweekly,
* nth weekday of month,
* nth weekday every other month
* nth weekday from end of month
* nth weekday from end of other month
* yearly

- Display actual recurrences in recurrence event listing in master data.

- If there are two reccurred events matching in date, time and category only
the one is rendered thats recurring event occurres more seldomly.

- Day numbers are now add-links to create a new event for the day.

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Features
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- Add concept of recurring events, see master data of calendar to configure them.

Bug fixes
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- The calendar tab in the main menu is now highlighted when the calendar, an
event or calendar masterdata is displayed.

- Events are displayed on the correct local day (according to chosen time
zone) even if it is another one than the one in UTC.

Other
-----

- Adapt tests and code to changes in `icemac.addressbook 2.5`.

- Add py.test to run the tests.

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- Color the current day on the calendar.

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- Fix the widh of the calendar to the width of the window.

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- Made selection of month for display two drop downs for month and year.

- Added calendar view displaying a whole year.

- Allow calendar users to edit their username and/or password in master
data.

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- Selected month is kept in session, to ease editing in another month than
the current one. (requiring at least `icemac.addressbook 2.2`)

- Bugfix: empty field values are no longer displayed in the calendar.