[PQM/MERGE] Remove Python 2.3 support

[John Arbash Meinel]

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Daniel Watkins wrote:
| Attached is a patch which modified the checking for a minimum version
| of Python 2.3 to be the same as bzr's checking for a minimum version of
| Python 2.4.
|
| As PQM is moving to support bzr only and bzr doesn't support anything
| below Python 2.4, it doesn't really make sense for PQM to support
| Python 2.3.
|
| It isn't dependent on any of my other work.
|
|

Who is doing the actual PQM reviews? I feel like this patch is fine, but
I'm certainly not going to consider myself a PQM maintainer :)

John
=:->

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