clear project-level upload and download backoffs,
as well as RPC and individual xfer backoffs.
This was an oversight.
svn path=/trunk/boinc/; revision=24621
If the file "client_opaque.txt" exists on the client,
include its contents in scheduler request messages.
On the scheduler, parse this into SCHEDULER_REQUEST::client_opaque,
where it can be used by the customizable scheduler functions.
svn path=/trunk/boinc/; revision=24586
David Anderson