Specific RPCs for sendrevealall and sendredeemall to prevent human error

[tynes]

For the wallet RPCs sendreveal and sendredeem if no name argument is passed, it will attempt to batch all of the reveals/redeems between names into a single transaction. This is a useful feature, but prone to user error if name is accidentally undefined for example.

It may be a good idea to add specific RPCs sendrevealall and sendredeemall to prevent this problem. The HTTP endpoints could be updated to reflect this as well with either additional endpoints POST /wallet/:id/revealall and POST /wallet/:id/redeemall or with POST body options.

Originally posted by @tynes in #145