About PRT, PEI

Like ETH and wei in Ethereum, PRT and PEI are used in the Token API.

1 PRT	= 1,000,000,000,000,000,000 PEI = 1 (EXA)PEI
1 (MILLI)PRT = 0.001 PRT	= 1,000,000,000,000,000 PEI = 1 (PETA)PEI
1 (MICRO)PRT = 0.000001 PRT	= 1,000,000,000,000 PEI = 1 (TERA)PEI
1 (Nano)PRT = 0.000000001 PRT	= 1,000,000,000 PEI = 1 (GIGA)PEI
1 (PICO)PRT = 0.000000000001 PRT	= 1,000,000 PEI = 1 (MEGA)PEI
1 (FEMTO)PRT = 0.000000000000001 PRT	= 1,000 PEI = 1 (KILO)PEI
1 (ATTO)PRT = 0.000000000000000001 PRT	= 1 PEI