[A-479] Slackware 13.1 is released!

That's right, another stable release of Slackware is finally ready to go. Slackware 13.1 is available in both 32-bit x86 and 64-bit x86_64 editions, and brings with it many major improvements, like KDE SC version 4.4.3, the 2.6.33.4 Linux kernel, a new toolchain, updated libraries, and major applications such as Firefox and Thunderbird.