[Svnmerge] Running svnmerge in a subprocess

[Simon Brunning]

I've had trouble running svnmerge programmatically via another Python
script. I've tried both popen2.popen4() and the subcomand module, but
both give me "stty: stdin isn't a terminal".

The attached patch seems to fix this OK - there's no point running
stty if svnmerge isn't running in a tty, and there's a sensible
default value provided.

Look OK?

--
Cheers,
Simon B.
simon at brunningonline.net
http://www.brunningonline.net/simon/blog/
GTalk: simon.brunning | MSN: small_values | Yahoo: smallvalues | Twitter: brunns
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