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RFE: merge driver without overwrite

The current definition for merge drivers require the output file %A to be
overwritten. When using a pipeline of Unix commands, this often results in %A
being truncated too early, requiring the user to add a temporary file managed

It would be far preferable if git could manage this; perhaps an %N marker for
a temporary filename, which, if given, is treated as the output; notionally:

	if [ $? -eq 0 -a -f %N ]; then mv -f %N %A; else rm -f %N; fi