Make settxfee clear that units are btc/kb.
Merge pull request #2978 from gmaxwell/rpc_settxfee_doc

Make settxfee clear that units are btc/kb.
Bitcoin-Qt: Use qDebug() for printing to debug.log

- removes all usages of PrintDebugStringF from Qt code
- ensure same format for all debug.log messages "functionname : Message"
qt: add vout index to transaction id in transactions details dialog
Merge pull request #2973 from Diapolo/qDebug

Bitcoin-Qt: Use qDebug() for printing to debug.log
Merge pull request #2976 from laanwj/2013_09_txid_details

qt: add vout index to transaction id in transactions details dialog