Merge from viewer2 trunk.

doc/contributions.txt

indra/llcommon/CMakeLists.txt

indra/llcommon/llerrorlegacy.h

indra/llcommon/llfasttimer.h

indra/llcommon/llfasttimer_class.cpp

indra/llcommon/llfasttimer_class.h

indra/llcommon/llpreprocessor.h

indra/llrender/llimagegl.cpp

indra/llrender/llimagegl.h

indra/llui/llaccordionctrl.cpp

indra/llui/llaccordionctrl.h

indra/llui/llaccordionctrltab.cpp

indra/llui/llaccordionctrltab.h

indra/llui/lllineeditor.cpp

indra/llui/llscrolllistctrl.cpp

indra/llui/llscrolllistctrl.h

indra/llui/llscrolllistitem.h

indra/llui/lltextbase.cpp

indra/llui/lltextbase.h

indra/llui/lltexteditor.cpp