[PATCH] enhance svn diff by adding --diff-copy-from switch

[Prabhu Gnana Sundar Ponnarasu]

Hi,

This patch enhances the current "svn diff" by adding a new "--diff-copy-from" 
switch. I have attached the patch and the log message along with this mail. 
Please review and share your comments on the same.



Thanks and regards
Prabhu