[Bug 174961]

[Michael Duelli]

I think having this functionality as an add-on works quite well and
keeps out cross-dependencies between lightning and addressbook.

However, I would propose to show a hint on recommended add-ons which is
shown whenever installing/updating lightning (at least).

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https://bugs.launchpad.net/bugs/174961

Title:
  Allow calendar for birthdays from Thunderbird address book

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