Fixed sky editing floater.

indra/llinventory/llsettingssky.h

indra/newview/CMakeLists.txt

indra/newview/llfloaterfixedenvironment.cpp

indra/newview/llfloaterfixedenvironment.h

indra/newview/llpaneleditsky.cpp

indra/newview/llpaneleditsky.h

indra/newview/llviewerfloaterreg.cpp

indra/newview/llviewermenu.cpp

...newview/skins/default/xui/en/floater_fixedenvironment.xml

...newview/skins/default/xui/en/panel_settings_sky_atmos.xml

...ewview/skins/default/xui/en/panel_settings_sky_clouds.xml

...wview/skins/default/xui/en/panel_settings_sky_sunmoon.xml