declare all_mechanism in main to avoid NameError
declare all_mechanism in main to avoid NameError

Some spf declarations don't seem to have .all so you get the following error:
Traceback (most recent call last):
  File "spf", line 133, in <module>
    if __name__ == "__main__": main()
  File "spf", line 36, in main
    flat_spf += all_mechanism
NameError: global name 'all_mechanism' is not defined
0x9090/SPFlatten