[lm] Added a new page for myself and additional rrd loging

Changed linkmeterd.lua to record more data into rrd
Changed index.htm to ignore the extra
Added new test.htm to the lmadmin.lua to make it available
New test.htm page. Graphs out the PID values so they can be compared
against temp and controller outputs over time. Made it simpler to see
what the terms are doing long term.