Icemac-ab-calendar

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- Bring branch test coverage to 100 %.

- Adapt code and role configuration to `icemac.addressbook >= 2.9`.

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- Add some infrastructure for `icemac.ab.calexport`.

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- Allow to restrict which persons are listed in the person list on the event
using: Master Data > Calendar > Settings > Person keyword.

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Bugfixes
--------

- Fix a bug with daylight saving time adding one hour to each event during DST.

- Normalize non-recurring events to UTC to fix possibly wrong local time zone
values. **Caution:** Some events could not be fixed because they already have
a wrong time with the UTC time zone. But only some of the events with a UTC
time zone seem to have this offset. These ones have to be fixed by hand.
Sorry for the inconvenience.

- Listing of recurring events in calendar master data no longer displays a time
for whole-day events.

Features
--------

- Add a special style sheet for printing to render the calendar as a list on
paper. (Works in Safari, Firefox, Google Chrome and
Internet Explorer >= 10.x)

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- Bugfix: Since 1.7.0 locally defined calendar users no longer where able to
edit events.

==================

Features
--------

- Add new `daily` recurrence for recurring events.

- Add end date to recurring events.

- Newlines in the `nodes` field now lead to new items in the calendar view for
each line.

- Allow events to take place the whole day.

Bugfixes
--------

- Selecting a user defined field for display in calendar view resulted in an
error when displaying recurred events.

Other
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- No longer use `unittest2` as it was included in Python 2.7.

- Lint JS code.

- Use py.test as new test runner.

- Use package `icemac.recurrence` which was extracted for reuse from here.