Ehlers Trend Vigor Normalized

Thanks to MasBart, I updated the earlier version to normalize signal and lead according to vigor and trigger. Vigor and trigger are limited to +-2. Now signal and lead are also in that range.

The code of interest is lines 39-43:

tmpdif = (BP - nz(BP))/close
a = array.new_float(0)
for i = 0 to win-1
array.push(a, tmpdif)
den = array.max(a)

den is then used to normalize the BP values (bandpass filter).