mv --recursive

[Grady Martin]

Hello.  I have two questions:

· Is there a way to recursively merge two directories with move (not 
copy/delete) operations, using standard GNU utilities?
· If not, how do coreutils' maintainers feel about an -r/-R/--recursive patch 
for mv?

Example:

> ■ ls -R
> .:
> new  old
>
> ./new:
> src
>
> ./new/src:
> util.h
>
> ./old:
> src  README
>
> ./old/src:
> main.c
> ■ mv -R old new
> ■ ls -R
> .:
> new
>
> ./new:
> src  README
>
> ./new/src:
> main.c  util.h

Thank you.