cmd/vuvuzela-client: add command to delete sent friend requests

[aa153]

I have sent friend request to non-existant user (I suppose). Now I see this request after "/list" command but I can't delete it. Maybe it should just expire in NN days?

[0x1daniel]

Could /delfriend <username> be the correct solution?

[aa153]

No, I've got message "Cannot find friend <...>"

[0x1daniel]

Then this is a issue from my point of view, because there is no other command provided to delete something.

/cancel <username> would be a good command to provide such a function.

[0x1daniel]

https://github.com/vuvuzela/alpenhorn/blob/master/friendrequest.go#L70

Looks like it is only for a short time possible to remove. An implementation would be helpful anyway. Will implement it.

[0x1daniel]

The protocol doesn't allow deleting sent friend requests. Even when they are queued it is nearly impossible to remove them. I implemented it anyway https://github.com/oltdaniel/vuvuzela

So this issue can be closed

[aa153]

It's interesting, thank you.
Will check it later.