Exclude locked outputs for listunspent.

Fixes #104.
Remove stray fmt.Printf.
Clean up interface pointer ID handling.
Update for recent btcjson changes.

This commit updates the types to match the recent changes to the btcjson
result types.
IMPORT PATH MODIFICATION CHANGESET
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Please use this changeset as the first one on top of the conformal codebase.
Note that if there are new imports, they need to be changed as part of this
changeset. In general, use "git rebase" on github.com/conformal's version
and apply this changeset first.
Task #396 on Task Board:

Create a stub websocket call getdepositscript.