Buy/Sell Pressure Raw

// This is a port of the bar by bar Buy/Sell pressure indicator by Karthik Marar.
// See below link for further details.
// karthikmarar.blogspot.com/2012/09/buying-and-selling-pressure-indicator.html
// The only difference being I used the Hull moving average instead of WMA which the HullMA is a derivative of.
// Credits to Chris Moody for the HullMA code.
// All disclaimers apply