Gavin's Bitcoin patches

Branches here:

svn : up-to-date mirror of the 'production' Bitcoin (from http://sourceforge.net/projects/bitcoin/).
monitorreceived : Implements monitortransaction/monitorblocks/gettransaction/getblock RPC commands.
listtransactions: Implements new JSON-RPC command "listtransactions" (from jgarzik)
refundtransaction : Implements new JSON-RPC command "refundtransaction"
master : All of the above, merged together.