feature request: xffm: multi-rename

[purslow at sympatico.ca]

040118 edscott wilson garcia offered more helpful advice:

thanx lots: i will keep both your accounts for when i have time to learn.

BTW there wb no need to use the CLI 'rename' device:
the new utility wd simply construct a series of 'mv' commands
& cd display them as part of a 'test first' option.

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