Fix storage of network stat data to be Kilobits instead of Kilobytes

indra/newview/llstartup.cpp

indra/newview/llstatusbar.cpp

indra/newview/lltexturefetch.cpp

indra/newview/llviewerstats.cpp

indra/newview/llviewerstats.h

indra/newview/llworld.cpp

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

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

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