Money Flow Multiplier

Together with the Money Flow Volume part of the calculation for the Chaikin Money Flow. This multiplier is positive when the close is in the upper half of the period's high-low range and negative when the close is in the lower half. The multiplier equals 1 when the close equals the high and -1 when the close equals the low. In this way, the multiplier adjusts the amount of volume that ends up in Money Flow Volume. Volume is in effect reduced unless the Money Flow Multiplier is at its extremes (+1 or -1).

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Fixes:
- Added exception to prevent division with zero errors (pointed out by midtownsk8rguy)
Additions:
- Added a function call
- Added visual lines on -0.5, 0.0 and 0.5