[Patch] make test suite force use of Python 2.4

[Christophe Cavalaria]

Aaron Bentley wrote:

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> Since 2.4 is required, and the user won't have anything acceptable
> installed unless it's 2.4, let's run python2.4 instead of python.
> 
> Aaron
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And what will you do when Python 2.5 gets out ? Better to check for
sys.version_info and display a friendly error message.