[Owncloud] Merge request: Editing multiple calendars

[Thomas Olsen]

First: I'm a git newbie. I tried to request a merge from the Gitorious web 
interface, but got:

  This Git object is too large to be displayed in the browser

  Consider cloning the repository locally and look at the object there

I'm not sure how to proceed from there. My branch is at:

  https://gitorious.org/owncloud/tanghus-owncloud/trees/tanghus_remote_backup

The misleading branch name is because that is what I wanted to do to start 
with ;-)

I modified the export.php script from the contacts app and can now run backups 
with wget and http authentication. Hence the name 'tanghus_remote_backup' for
this branch.
Then I implemented the nice popup window function from Calendar for 
activating/CardDAV link/downloading/editing/deleting/adding address books.

When making changes to the address books the contact list is updated to show 
the contacts in the active address book(s).

When an address book is activated the setting is saved using 
OC_Preferences::setValue().

Most of the code is copy/paste from the Calendar and Contacts apps ;-)

Tested with fresh clone from git at gitorious.org:~tanghus/owncloud/tanghus-
owncloud.git, removed database and config.php.
I used two address books in the test with ~175 contacts in each. I don't know 
if the update of the contact list will scale when it's in the thousands, but 
they are inserted with a single ajax call so I would guess so.

Screen shot attached.

-- 
Med venlig hilsen / Best Regards

Thomas Tanghus Olsen
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