Hurst Exponent - optimized version - indicator for MetaTrader 5

Optimized version of the indicator originally published here : Hurst exponent . 

• Please read the original description for details
• the code can be further optimized (by using faster logarithm approximation - that would cause some precision loss - for example and some other code changes), but the gains would not be as "dramatical" as this version is compared to the first version