bug fix flex power zones

rowers/utils.py

@@ -1,4 +1,14 @@
 import math
+import numpy as np
+
+def serialize_list(value,token=','):
+    assert(isinstance(value, list) or isinstance(value, tuple) or isinstance(value,np.ndarray))
+    return token.join([unicode(s) for s in value])
+
+def deserialize_list(value,token=','):
+    if isinstance(value, list):
+        return value
+    return value.split(token)
 
 def geo_distance(lat1,lon1,lat2,lon2):
     """ Approximate distance and bearing between two points