merge changes for 5.0.2-release

.hgtags

doc/contributions.txt

indra/llkdu/llimagej2ckdu.cpp

indra/llmath/llvolume.cpp

indra/llmessage/llavatarname.cpp

indra/llmessage/llavatarname.h

indra/llui/llmenugl.cpp

indra/llui/llmenugl.h

indra/llui/llradiogroup.cpp

indra/llui/llradiogroup.h

indra/llui/llspellcheck.cpp

indra/llui/lltabcontainer.cpp

indra/llui/lltabcontainer.h

indra/llui/lltextbase.cpp

indra/llui/lltextbase.h

indra/llui/llurlentry.cpp

indra/llui/llurlentry.h

indra/llui/llurlregistry.cpp

indra/newview/VIEWER_VERSION.txt

indra/newview/app_settings/settings.xml