Fix billing graphs, thanks to delaf

git-svn-id: http://observium.org/svn/observer/trunk@4064 61d68cd4-352d-0410-923a-c4978735b2b8
it said Observer huhuhuh-huhuh-huhuhuhu

git-svn-id: http://observium.org/svn/observer/trunk@4065 61d68cd4-352d-0410-923a-c4978735b2b8
debug be gone

git-svn-id: http://observium.org/svn/observer/trunk@4066 61d68cd4-352d-0410-923a-c4978735b2b8