Mozilla Thunderbird fixes cc: problems, plus memory and security issues

The free Mozilla email client has revved a dot to 24.1, with the majority of the changes being bug fixes and plugged security holes.Gone are some improperly initialized memory and overflows in select Javascript functions, other sundry memory issues, and the same spoofing of an address bar that affected Firefox. Also fixed were too-light signatures and problems with CC'ing a message reply if the CC was the same as the sending address.

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