Add RPC 'get_msg_size'

[Mike O]

Im the guy working on Boinc.NET. I am wondering if a simple RPC can be added to the client to return the number of messages in the message queue? This would make it a bit easier using the 'seqno' tag. As it is, the only way to know the size of the queue, is to read the entire message queue. People that have been running clients on farms for weeks have queues that have thousands of lines in them. For some BDN users, Boinc.NET locks before all the messages can be read. Thanks.. --Mike

[davea]

(In [18576]) - GUI RPC: add get_message_seqno() RPC. fixes #931