I wanted to find all primes between 1985 and 2005, and
found out that Demo/scripts/primes.py is not usable as
a module, because it unconditionally executes main().
This patch adds a 'if __name__ == "__main__"' block
around the execution of the main() function, so that
one can simply import primes and use
primes.primes(1985, 2005) in order to achieve what I
wanted to achieve.

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If you're going to improve this one, consider going all the way.

* Modernize the code -- the current version reads like Cobol
* Stop building the sieve after sqrt(MAX) entries have been
found.  Possibly use islice() to check only the relevant
entries in the primes table.
* Change the API to:  prime x [n]  which finds the first n
(default 1) primes larger than x.  prime(10,3) --> [11, 13, 17]
* If x is large, switch to a modern primality testing
algorithm so that arbitrarily large primes can be found
(perhaps for RSA purposes or some such).

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Hm, I don't think I have enough mathematical knowledge to go
'all the way', although some of the suggestions are doable.
I'll have a look at it next week (week of Jan-26). 

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Gerrit, are you still interested in doing this? I'll just
check in this patch if not.

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Well, I just checked in this patch and added  'if __name__
== "__main__"' to a whole bunch of other modules too.