Enhance rename function

[scrutch]

With multi-node Z-Wave devices, renaming has become tedious. None of the options to rename all the related nodes.

I find that I always want a common prefix.  Unfortunately, when I create a device, there is no prefix.

At least provide an option to ADD a prefix to all associated devices.  

And please consider putting a prefix on the names of Z-Wave devices to begin with, e.g. 
ZW nnn.functional name or ZW nnn - functional name