[PATCH v5 2/5] cli: add support for replying just to the sender in "notmuch reply"

Add new option --reply-to=(all|sender) to "notmuch reply" to select whether to reply to all (sender and all recipients), or just sender. Reply to all remains the default. Credits to Mark Walters for his similar earlier work where I picked up the basic idea of handling reply-to-sender in add_recip

[PATCH v5 2/5] cli: add support for replying just to the sender in "notmuch reply"

Add new option --reply-to=(all|sender) to "notmuch reply" to select whether to reply to all (sender and all recipients), or just sender. Reply to all remains the default. Credits to Mark Walters for his similar earlier work where I picked up the basic idea of handling reply-to-sender in add_recip