Update SolarPV_lowMem_Dev/SolarPV_lowMem_Dev.ino

Changed some ints to bytes
Update SolarPV_lowMem_Dev/templates.ino

A Few ints to bytes
Update SolarPV_lowMem_Dev/SolarPV_lowMem_Dev.ino

LDR code.
Update SolarPV_lowMem_Dev/templates.ino

even more ints to bytes
Merge pull request #8 from rob-walker/master

further variable optimizations and add transmission of light level to emonBase