Merged in my DEV-35401 "doubleton" fix.

indra/integration_tests/llui_libtest/llui_libtest.cpp

indra/llcharacter/llmultigesture.cpp

indra/llcharacter/llmultigesture.h

indra/llcharacter/llpose.cpp

indra/llcommon/llsingleton.h

indra/llrender/llfontfreetype.cpp

indra/llui/llcombobox.cpp

indra/llui/llcombobox.h

indra/llui/llfloater.cpp

indra/llui/llfloater.h

indra/llui/llfloaterreg.cpp

indra/llui/llmenugl.cpp

indra/llui/llmenugl.h

indra/llui/llmodaldialog.cpp

indra/llui/llmodaldialog.h

indra/llui/llmultifloater.cpp

indra/llui/llmultifloater.h

indra/llui/llnotifications.h

indra/llui/llpanel.cpp

indra/llui/llpanel.h