NET_CTRLMSG_ACCEPT isn't enough to accept the connection: This message was basically unused (irrelevant for the connection establishment); I removed it from the code and renamed the NET_CTRLMSG_CONNECTACCEPT to NET_CTRLMSG_ACCEPT.
CDataFile::GetDataSize returns the data size in the file, this is of basically no use to the user. The only two callers use it differently: in CDataFile::GetData uses it as the size in file // in `map_resave.cp...
