Added standard python main()

This patch adds the standard python main() and
the requisite test for the script name.

aprsd.py

@@ -323,21 +323,22 @@ def send_email(to_addr, content):
 
 
 ### main() ###
-try:
+def main():
+  try:
     tn = telnetlib.Telnet(HOST, 14580)
-except Exception, e:
+  except Exception, e:
     print "Telnet session failed.\n"
     sys.exit(-1)
 
-time.sleep(2)
+  time.sleep(2)
 
-tn.write("user " + USER + " pass " +  PASS + " vers aprsd 0.99\n" )
+  tn.write("user " + USER + " pass " +  PASS + " vers aprsd 0.99\n" )
 
-time.sleep(2)
+  time.sleep(2)
 
-check_email_thread()  # start email reader thread
+  check_email_thread()  # start email reader thread
 
-while True:
+  while True:
     line = ""
     try:
        for char in tn.read_until("\n",100):
@@ -464,7 +465,6 @@ while True:
             reply = "Unable to find you (send beacon?)"
             send_message(fromcall, reply)
 
-
        # USAGE
        else:
           reply = "usage: time, fortune, loc, weath, -emailaddr emailbody, -#(resend)"
@@ -480,8 +480,10 @@ while True:
        #sys.exit(1)  # merely a suggestion
        os._exit(1)
 
-# end while True
+  # end while True
+  tn.close()
+  exit()
 
-tn.close()
 
-exit()
+if __name__ == "__main__":
+    main()