Changebar only works with files in the current directory.  For example,

	changebar foo1 foo2

works fine, but:

	changebar /tmp/foo1 /otherpath/foo2

does not work.  I believe that patch is having a problem with paths.

So this is just a quick warning to users that this limitation exists.
I do not plan to fix it, however a user who wanted to fix the situation
could, I suppose, copy each file to a known name in /tmp, for example,
then pushd to /tmp, do the changebar work there, then delete the temp
files, copy the .chbar result to the original directory and finally
get rid of any other temp files that we created.

Rob Peck
