SH-3075 : Fix reversible compression for very small textures. Also supress the forcing to reversible for small textures.

don't auto position other floater when it is hosted

For SH-3121: collect time of reloading all textures from cache and through HTTP when all objects loading are done.

As a viewer architect, I would like to understand how fast each of the components of the texture pipeline can run in isolation

Added checks for LLViewerRegion pointer in LLViewerObject being invalid.

Mindful that some autobuild packages populate only packages/lib/release
(rather than packages/lib/debug), Linking.cmake always appends
packages/lib/release to CMake's link_directories() directive. But since CMake
always appends CMAKE_BUILD_TYPE to those directories, we end up with a phantom
packages/lib/release/Release directory on the search path. This would be
harmless except that the Mac's 'ld' command produces a warning. These warnings
quickly make TC's "Important Messages" output useless. Try appending
packages/lib/release only when the build type isn't already Release.

WOLF-363: (partial) correct ordering of cleaning build dir vs running
          'autobuild install'