Log Message:
Update thunderbird and thunderbird-gtk1 to 2.0.0.19.

Security fixes in this version:

MFSA 2008-68 XSS and JavaScript privilege escalation
MFSA 2008-67 Escaped null characters ignored by CSS parser
MFSA 2008-66 Errors parsing URLs with leading whitespace and control characters
MFSA 2008-65 Cross-domain data theft via script redirect error message
MFSA 2008-64 XMLHttpRequest 302 response disclosure
MFSA 2008-61 Information stealing via loadBindingDocument
MFSA 2008-60 Crashes with evidence of memory corruption (rv:1.9.0.5/1.8.1.19)

For more info, see http://www.mozilla.com/en-US/thunderbird/2.0.0.19/releasenotes/