I have two questions concerning the official Bitcoin client API:

First, getreceivedbyaccount is listed as taking two optional parameters: account and minconf.  However, the source in bitcoinrpc.cpp implies that the account parameter is actually mandatory.  Oversight in the wiki or error in the code?

Second, what exactly is the difference in semantics between the minconf optional parameter that several calls accept and the target-confirmations optional parameter accepted by listsinceblock?  I understand minconf well enough, but doesn't target-confirmations mean exactly the same thing?

Thank you guys!