removing not needed inputs and backend setting

examples/sagnac/master.py

@@ -3,18 +3,9 @@ from pykat.commands import *
 import copy
 from collections import namedtuple
 from collections import OrderedDict
-
-import matplotlib
-BACKEND = 'Qt4Agg'
-matplotlib.use(BACKEND)
 import pylab as pl
-
-formatter = matplotlib.ticker.EngFormatter(unit='', places=0)
-formatter.ENG_PREFIXES[-6] = 'u'
-
 from  pykat.utilities.plotting.tools import printPDF
 	
-	
 def main():
 	print """
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