dcdmdelta: Search for files with mismatching Date Created and Date Modified times

[raccoon]

A feature request.

dcdmdelta:
- Search for files with mismatching Date Created and Date Modified times.

dcdmdelta:>5days
- Search for files where the Date Created and Date Modified times are greater than 5 days different.

[void]

Arithmetic on dc: and dm: is on my TODO list.

Thanks for the suggestion.