Adjust various CLI display ratios to arbitrary precision

Originally the deviations from using float64 were insignificant, but at
exabyte scale they start to show up. Cleanup all displays, and clarify
the expectation text, adding an extra 99.9% probability calculator to
`lotus-miner info`

cli/state.go

@@ -183,18 +183,23 @@ var StateMinerInfo = &cli.Command{
 			return err
 		}
 
-		rpercI := types.BigDiv(types.BigMul(pow.MinerPower.RawBytePower, types.NewInt(1000000)), pow.TotalPower.RawBytePower)
-		qpercI := types.BigDiv(types.BigMul(pow.MinerPower.QualityAdjPower, types.NewInt(1000000)), pow.TotalPower.QualityAdjPower)
-
 		fmt.Printf("Byte Power:   %s / %s (%0.4f%%)\n",
 			color.BlueString(types.SizeStr(pow.MinerPower.RawBytePower)),
 			types.SizeStr(pow.TotalPower.RawBytePower),
-			float64(rpercI.Int64())/10000)
+			types.BigDivFloat(
+				types.BigMul(pow.MinerPower.RawBytePower, big.NewInt(100)),
+				pow.TotalPower.RawBytePower,
+			),
+		)
 
 		fmt.Printf("Actual Power: %s / %s (%0.4f%%)\n",
 			color.GreenString(types.DeciStr(pow.MinerPower.QualityAdjPower)),
 			types.DeciStr(pow.TotalPower.QualityAdjPower),
-			float64(qpercI.Int64())/10000)
+			types.BigDivFloat(
+				types.BigMul(pow.MinerPower.QualityAdjPower, big.NewInt(100)),
+				pow.TotalPower.QualityAdjPower,
+			),
+		)
 
 		fmt.Println()
 
@@ -302,8 +307,15 @@ var StatePowerCmd = &cli.Command{
 		tp := power.TotalPower
 		if cctx.Args().Present() {
 			mp := power.MinerPower
-			percI := types.BigDiv(types.BigMul(mp.QualityAdjPower, types.NewInt(1000000)), tp.QualityAdjPower)
-			fmt.Printf("%s(%s) / %s(%s) ~= %0.4f%%\n", mp.QualityAdjPower.String(), types.SizeStr(mp.QualityAdjPower), tp.QualityAdjPower.String(), types.SizeStr(tp.QualityAdjPower), float64(percI.Int64())/10000)
+			fmt.Printf(
+				"%s(%s) / %s(%s) ~= %0.4f%%\n",
+				mp.QualityAdjPower.String(), types.SizeStr(mp.QualityAdjPower),
+				tp.QualityAdjPower.String(), types.SizeStr(tp.QualityAdjPower),
+				types.BigDivFloat(
+					types.BigMul(mp.QualityAdjPower, big.NewInt(100)),
+					tp.QualityAdjPower,
+				),
+			)
 		} else {
 			fmt.Printf("%s(%s)\n", tp.QualityAdjPower.String(), types.SizeStr(tp.QualityAdjPower))
 		}