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.