MAINT-8052: Report if the returned environment is the default.

indra/llinventory/llparcel.cpp

indra/llinventory/llparcel.h

indra/llinventory/llsettingsdaycycle.cpp

indra/newview/CMakeLists.txt

indra/newview/llenvironment.cpp

indra/newview/llenvironment.h

indra/newview/llfloaterland.cpp

indra/newview/llfloaterland.h

indra/newview/llfloaterregioninfo.cpp

indra/newview/llfloaterregioninfo.h

indra/newview/llviewerregion.cpp

indra/newview/llviewerregion.h

indra/newview/skins/default/xui/en/floater_about_land.xml

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

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