Log Message:
Update thunderbird and thunderbird-gtk1 to 2.0.0.23.

Security fixes in this version:

MFSA 2009-43 Heap overflow in certificate regexp parsing
MFSA 2009-42 Compromise of SSL-protected communication

For more info, see http://www.mozilla.com/en-US/thunderbird/2.0.0.23/releasenotes/