Allow atomic put/delete in one call

Right now we have the following calls:

put(Put)
delete(Delete)
increment(Increments)

But we cannot combine all of the above in a single call, complete with a single row lock. It would be nice to do that.

It would also allow us to do a CAS where we could do a put/increment if the check succeeded.

Amendment:
Since Increment does not currently support MVCC it cannot be included in an atomic operation.
So this for Put and Delete only.