[RS]ZigZag Percent Reversal - Multiple Statistics

Multiple Statistics from zigzag:
• Price range between swings.
• Bar range between swings.

returns maximum value, avg value and mean deviation.

if you find something missing, please leave a message bellow.

版本注释:

added:

• higher high swing sequence
  
• lower low swing sequence
  
• higher high and lower low swing sequence
  

improved the code.