[Svnmerge] updates for python 2.6?

[Jon Schewe]

Once I updated to python 2.6 I started noticing this warning.

/home/jpschewe/bin/svnmerge.py:71: DeprecationWarning: The popen2 module
is deprecated.  Use the subprocess module.
  import sys, os, getopt, re, types, tempfile, time, popen2, locale

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Jon Schewe | http://mtu.net/~jpschewe
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