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.
