DELTA_RADIUS: M666: add R code for radius, store it in EEPROM

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extra : source : 9bca92c9aba14841c717c22b0513d60a1171d856
DELTA_DIAGONAL_ROD: M666: add D code for diagonal rod, store it in EEPROM
DELTA_DIAGONAL_ROD: M666: add D code for diagonal rod, store it in EEPROM

--HG--
extra : source : 0d25c772da030a4ec2ac9ca78eb5fc8287a762b2
Merge