Improve wallet history tab:

- use json-serializable types
- add toolbar to history tab
- add button to display time interval

lib/plot.py

@@ -14,17 +14,16 @@ from matplotlib.patches import Ellipse
 from matplotlib.offsetbox import AnchoredOffsetbox, TextArea, DrawingArea, HPacker
 
 
-def plot_history(wallet, history):
+def plot_history(history):
     hist_in = defaultdict(int)
     hist_out = defaultdict(int)
     for item in history:
-        tx_hash, height, confirmations, timestamp, value, balance = item
-        if not confirmations:
+        if not item['confirmations']:
             continue
-        if timestamp is None:
+        if item['timestamp'] is None:
             continue
-        value = value*1./COIN
-        date = datetime.datetime.fromtimestamp(timestamp)
+        value = item['value'].value/COIN
+        date = item['date']
         datenum = int(md.date2num(datetime.date(date.year, date.month, 1)))
         if value > 0:
             hist_in[datenum] += value