func Round(input, agg float64) float64 {
	return float64(int64(((input / agg) + 0.5))) * agg
}
rounds [input] to to nearest multiple of [agg]
package aggregation
import (
	"math"
	"github.com/svanas/nefertiti/errors"
	"github.com/svanas/nefertiti/model"
	"github.com/svanas/nefertiti/precision"
)
var (
	EOrderBookTooThin = errors.New("Cannot find any supports. Order book is too thin. Please reconsider this market.")
)