Simple Machines Forum 1.1.5 and 1.0.13 released

This version fixes the following issues:

* Sanitation of $topic wasn't always done right.
* Increased the randomness of the Captcha sound.
* Require the Memcached version that's compiled into PHP to ensure a better performance.
* Improved the random generator seeding for PHP < 4.2.0 - issue reported by Jessica Hope.
* Fixed a vulnerability with the use of the html-tag - issue reported by Jessica Hope.
* Fixed the CRC function not working properly on 64-bit systems.
* Fixed remembering the infocenter collapse status for guests.
* Don't send the admin a new registration email just because a member changed their email address.