EXT-7399: FIXED: 2.0.2 with http textures loads textures slower than 1.23.5

and possible fix for EXT-5704: FPS drop, and this could be cause freez and crash.

and possible fix for EXT-5704: FPS drop, and this could be cause freez and crash.

* Fixed bug in llqueuedthread.cpp causing unnecesssary sleeeping
* Fixed an issue that was preventing retries on 503 errors
* Added number of pending creates to Texture View
* Increased time allocated for texture creates

Also a fix for texture purging when reducing the cache size.

ignore-dead-branch

Merge latest 1.26 into trunk

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.