Present a login link, regardless of the state of login
Syntax: %LOGINURL%
Expand to: /twiki/bin/login/TWiki/VarLOGINURL?origurl=/twiki/bin/view/TWiki/VarLOGINURL%3fcover%3dprint%253bcover%253dprint%25253bcover%25253dprint%2525253brev%2525253d1%25253brev%25253d1%253brev%253d1%26rev%3d1