Main-ify record.py

Renamed record to main and made it auto-run the main routine when
executed from command line. To make it easier to run therein, added
shebang and made it executable.

Also fixed a copy-paste error on the name of the serial port var.

record.py → main.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python
 import os
 import serial
 
@@ -28,8 +29,10 @@ def main():
   port = open_serial()
 
   while True:
-    outfile.write(ser.readline())
+    outfile.write(port.readline())
 
   outfile.close()
   port.close()
 
+if __name__ == "__main__":
+  main()