Improved edition cloning

[demiankatz]

Right now, when you clone an edition, you get all-default behavior. It would be helpful to have an advanced clone option which pops up a dialog box that can control some or all of these things:

• The name of the cloned edition
• The name(s) of child clone editions, if applicable
• Which attributes and associated data get copied to the clone
• The "sort order within item" value (perhaps it should be incremented by default?)

[waktool]

As a standalone, item 4 should be easier to implement and would be beneficial without the other three. Get the current edition's sort order and add 1. This should place the cloned edition immediately after the original edition (even if that sort order is already assigned to another edition), which would make things easier (or more intuitive in my opinion).