Note: potential ABI break here, but people should
        only really be using virError structs returned from
        libvirt itself.

        * include/libvirt/virterror.h: add virNetwork
        to virError

        * src/internal.h, src/virterror.c: add network param
        to __virRaiseError()

        * src/conf.c, src/hash.c, src/libvirt.c, src/proxy_internal.c,
        src/qemu_internal.c, src/sexpr.c, src/test.c, src/xen_internal.c,
        src/xend_internal.c, src/xm_internal.c, src/xml.c, src/xmlrpc.c,
        src/xs_internal.c: update.