overheat only uses one temp probe

[lnevo]

Change the methodology to use bit flags for overheat ports so you can monitor multiple probes for the overheat condition

define T1_PROBE_BIT 1<<0

define T2_PROBE_BIT 1<<1

define T3_PROBE_BIT 1<<2

http://forum.reefangel.com/viewtopic.php?p=45498#p45498