DefaultCoinSelector to prefer coins requiring rotation, maybe "actively" rotate coins

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I think DefaultCoinSelector should take into account wether a coins needs 
rotation or not. If it does, it should be picked asap.

As an option, it could even pick all coins needing rotation, such that after 
one transaction your whole wallet is safe again. Of course it would drive the 
fee higher than expected. A middle ground would be adding inputs for coins to 
rotate for as long as the fee doesn't rise.

Original issue reported on code.google.com by andreas....@gmail.com on 1 Nov 2014 at 4:24

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Original comment by andreas....@gmail.com on 1 Nov 2014 at 4:24

• Changed state: New
• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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If a rotation is needed, it's probably best to do it ASAP, I think, rather than 
waiting for a spend.

Original comment by he...@vinumeris.com on 1 Nov 2014 at 4:45