Bugfix release:
- The Dialpad will correctly convert the dialled number if it's stored w/ intl. prefix and the number is in your own country

• Exclude contacts from export
• Show vanity and quickdial numbers in the contacts preview pane
• Internal restructuring to match addons.mozilla.org quality standards
• Tunderbird 3.1 compatible

New features:
Start an actual using the thunderbird contacts preview (has to be enabled in the AddOn-settings).
Compatible with the upcomming Thunderbird 3.1
Fixes:
Improved phone number conversion on intl. notation (e.g. +49 ...) (Bug: 2965605)
Better error message for unsupported firmware versions (Bug: 2964647)
The contact preview pane was not always updated correctly (Bug: 2955425)