This patch removes the "copymod" attribute from the gitpatch
class.
AFAICS, that attribute was only used to delay the copying of
renamed/copied files if there are no other changes to the target,
but in this case, if there are changes to the source, we'll end
up copying the wrong version.
This should fix issue762.
Add a trailing TAB to the "--- filename" lines if there's a space
in the file name. This allows patch(1) to work correctly. The
same is done for diff --nodates.
This was originally suggested by Andrei Vermel, but at the time
I thought git was doing something different.
