* Floater positioning now based on position of other cascading windows currently

indra/llui/llfloater.cpp

indra/llui/llfloater.h

indra/llui/llfloaterreg.cpp

indra/llui/llfloaterreg.h

indra/newview/llnearbychatbar.cpp

indra/newview/llnearbychatbar.h

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

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

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