8 Pair Strength R2.0 updated by JustUncleL

This is an updated script Originally written by @glaz

Description:
This study is a version of Currency Strength Meter, that utilises TradingView's built-in "True Strength Index" (TSI) function. The TSI uses moving averages of the underlying momentum of a financial instrument.

Modifications:
10-Nov-2017 by JustUncleL

• Corrected the weighting on JPY pairs, by dividing their close values by 100 to bring them within 1.0 range of the other pairs.
  
• Added option to use different Data Source, eg hl2, hlc3, ohlc4 etc.
  
• Updated to PineScript version 3.
  
• Updated variable names to reflect their origin.
  

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Some minor changes.

• Added max_bars_back=100 parameter to study line. This should prevent "index out depth" errors, which appear to occur at random.
  
• Added minval/maxval limits to fast and slow.
  
• Changed order of plots so they show up in alphabetic order in the "Style" parameters of the script.
  
• Increased default linewidth.
  

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Added with optional Dynamic coloured labels at the end of the Strength lines.

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... R2.2 by JustUncleL

• Improved labelling options.
  
• Added option to use ATR weighted (default) pair influences in the Strength calculations, the overall results compared with standard calculation though are only minor, but may help in certain situations.