* src/internal.h: virDomain.handle refers to the "id"
	in the API, so re-name to virDomain.id to avoid
	confusion.

	* src/hash.c, src/libvirt.c, src/proxy_internal.c, src/test.c,
	src/xen_internal.c, src/xend_internal.c, src/xm_internal.c,
	src/xml.c, src/xs_internal.c: update for rename.