Merged in graham_linden/viewer-eep-fixes (pull request #261)

indra/llinventory/llsettingssky.cpp

indra/llinventory/llsettingssky.h

indra/llrender/llshadermgr.cpp

indra/llrender/llshadermgr.h

...newview/app_settings/shaders/class1/deferred/cloudsV.glsl

...a/newview/app_settings/shaders/class1/deferred/moonF.glsl

...view/app_settings/shaders/class1/deferred/shadowUtil.glsl

indra/newview/app_settings/shaders/class1/deferred/skyF.glsl

.../newview/app_settings/shaders/class1/deferred/starsF.glsl

.../newview/app_settings/shaders/class1/deferred/waterF.glsl

indra/newview/app_settings/shaders/class2/deferred/skyF.glsl

...ew/app_settings/shaders/class2/deferred/softenLightF.glsl

.../app_settings/shaders/class2/windlight/atmosphericsF.glsl

.../app_settings/shaders/class2/windlight/atmosphericsV.glsl

...ewview/app_settings/shaders/class2/windlight/cloudsV.glsl

...a/newview/app_settings/shaders/class2/windlight/skyV.glsl

indra/newview/lldrawpoolavatar.cpp

indra/newview/lldrawpoolwater.cpp

indra/newview/lldrawpoolwlsky.cpp