gui_http.cpp

        this gets called when the op fails, either at initialization or later on;
        it clears the project's sched_rpc_pending flag if needed.
        This fixes a bug that caused user-requested RPCs to retry every 10 seconds
        when the network is down.
    - client: if debt-adjust period is too long, reset accounting.
        Otherwise we'll get this infinitely.
    - API: all optional alpha argument to TEXTURE_DESC::draw()

svn path=/trunk/boinc/; revision=17195