Update to 2.16

* enigmail is broken

Changelog:
SeaMonkey-specific changes
    Reply to List is now supported.
    SSL-related warning prompts (leaving or entering a secure site, viewing mixed content) have been replaced by less intrusive, non-modal notification bars.
    See the changes page for minor changes.

Mozilla platform changes
    Image quality has been improved through a new HTML scaling algorithm.
    Canvas elements can export their content as an image blob using canvas.toBlob() now.
    CSS @page is now supported.
    CSS viewport-percentage length units have been implemented (vh, vw, vmin and vmax).
    CSS text-transform now supports full-width.
    Fixed several stability issues.

Fixed in SeaMonkey 2.16
MFSA 2013-28 Use-after-free, out of bounds read, and buffer overflow issues found using Address Sanitizer
MFSA 2013-27 Phishing on HTTPS connection through malicious proxy
MFSA 2013-26 Use-after-free in nsImageLoadingContent
MFSA 2013-25 Privacy leak in JavaScript Workers
MFSA 2013-24 Web content bypass of COW and SOW security wrappers
MFSA 2013-23 Wrapped WebIDL objects can be wrapped again
MFSA 2013-22 Out-of-bounds read in image rendering
MFSA 2013-21 Miscellaneous memory safety hazards (rv:19.0 / rv:17.0.3)

(ryoon)