Update to 24.2.0

Changelog:
    FIXED
    Security fixes can be found here
    FIXED
    Fixed an issue where long messages with multiple signatures could end up unreadable (bug 929006)
    FIXED
    Fixed an issue where editing account settings was not possible in some non-standard configurations of local folder set-ups (bug 921371)

Fixed in Thunderbird 24.2
MFSA 2013-117 Mis-issued ANSSI/DCSSI certificate
MFSA 2013-116 JPEG information leak
MFSA 2013-115 GetElementIC typed array stubs can be generated outside observed typesets
MFSA 2013-114 Use-after-free in synthetic mouse movement
MFSA 2013-113 Trust settings for built-in roots ignored during EV certificate validation
MFSA 2013-111 Segmentation violation when replacing ordered list elements
MFSA 2013-109 Use-after-free during Table Editing
MFSA 2013-108 Use-after-free in event listeners
MFSA 2013-104 Miscellaneous memory safety hazards (rv:26.0 / rv:24.2)

(ryoon)