fix TraceWin.partran

seems number of header lines vary..

ess/TraceWin.py

@@ -651,6 +651,8 @@ class partran(dict):
         stream=file(self.filename,'r')
         for i in xrange(10):
             line=stream.readline()
+            if line.strip()[0]=='#':
+                break
         self.columns=['NUM']+line.split()[1:]
         self.data=numpy.loadtxt(stream)