make it compile and rename indicators

Author: Skinok

custom_indicators/BollingerBandsBandwitch.py

@@ -0,0 +1,14 @@
+from backtrader import bt
+
+class BollingerBandsBandwitch(bt.ind.BollingerBands):
+
+    '''
+    Extends the Bollinger Bands with a Percentage line and a Bandwitch indicator
+    '''
+    lines = ('bandwitch',)
+    plotlines = dict(bandwitch=dict(_name='%Bwtch'))  # display the line as %B on chart
+
+    def __init__(self):
+        super(BollingerBandsBandwitch, self).__init__()
+        self.l.bandwitch = 100 * (self.l.top - self.l.bot) / self.l.mid
+        pass