Add --font option, to specify font (.ttf) file to use for labels.

diff --git a/stats.py b/stats.py
index 107d494..a054bb3 100755
--- a/stats.py
+++ b/stats.py
@@ -2,6 +2,8 @@
 # encoding: utf-8

 import os
+import sys
+from getopt import getopt
 from copy import copy
 from math import sqrt

@@ -207,6 +209,17 @@ class GUI(object):
     gtk.main()

 if __name__ == "__main__":
+
+  fontopt = ""
+  if len(sys.argv) > 1:
+    opts,args = getopt(sys.argv[1:],"f:",["font="])
+    for k,v in opts:
+      font = v
+    path = os.path.dirname(font)
+    fontname = os.path.basename(font)
+    fontopt = "-font " + ".".join(fontname.split(".")[:-1])
+    os.putenv("GDFONTPATH",path)
+
   VARS = []
   data = []
   l = 0
@@ -233,12 +246,12 @@ if __name__ == "__main__":
   s = sigma(data)

   write_script(data,M,s)
-  os.system("ploticus -maxproclines 20000 -png %s -o %s" % (TMPPLOT,TMPPNG))
+  os.system("ploticus %s -maxproclines 20000 -png %s -o %s" % (fontopt,TMPPLOT,TMPPNG))

   gui = GUI()
   gui.show(M,D,s)

-  os.remove(TMPPLOT)
+#   os.remove(TMPPLOT)
   os.remove(TMPPNG)

   print "MX: %s\nDX: %s\nσX: %s\n" % (M,D,s)