PATH-735: Limit and clean up grid selection

indra/newview/app_settings/cmd_line.xml

indra/newview/llappviewer.cpp

indra/newview/llappviewerlinux.cpp

indra/newview/llfloatermodelpreview.cpp

indra/newview/llmarketplacefunctions.cpp

indra/newview/llpanellogin.cpp

indra/newview/llslurl.cpp

indra/newview/llstartup.cpp

indra/newview/llurldispatcher.cpp

indra/newview/llviewernetwork.cpp

indra/newview/llviewernetwork.h

indra/newview/llweb.cpp

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

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

indra/newview/tests/lllogininstance_test.cpp

indra/newview/tests/llviewernetwork_test.cpp