pass the pubkey needed to sign along with the sig_hash
elaborate NODE documentation
fix namecoin expiration; it's 36k blocks
better error handling for #create_tx and #assemble_tx command
improve monitoring of unconfirmed tx
fix asking for getblocks
prevents blockchain sync from getting stuck (thanks warren!)
tx forwarder example demonstrating the "monitor output" and "create/assemble tx" API
Script: handle pk_script and script_sig separately

never execute the script_sig, only push it onto the stack as data before running the pk_script.

one can still pass the script_sig + pk_script as one string, for backward compatibility.