Add option to ignore single messages when performing any actions

[djwf]

I'm frustrated when I perform the following operations:

• Select one of each duplicate, as well as the single messages, and move to a mailbox
• Select all of the messages that duplicate the messages selected in the previous step, and move to a different mailbox.

The solution I'd like to see is described in #146 (response #146 (comment)), and provides the option to ignore the single messages in any actions (only act upon messages that are part of a duplicate set).

[kdeldycke]

This has likely been fixed upstream with #286. It will be packaged with mail-deduplicate 6.2 that is going to be released soon.

[github-actions]

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