Import tools/ocaml/libs from xen-4.2

Conflicts:
	lib/mmap.ml
	lib/mmap.mli
	lib/mmap_stubs.c
	lib/uuid.ml
	lib/uuid.mli
	mmap/mmap.ml
	mmap/mmap.mli
	mmap/mmap_stubs.c
	mmap/xenmmap.ml
	mmap/xenmmap.mli
	mmap/xenmmap_stubs.c
Update to xenguest from xen-api
Fix OASIS config
Hopefully make xenguest_stubs compile against either 4.1 or 4.2
Fix some build errors on xen-4.1
Merge branch 'upgrade-to-4.2'

Conflicts:
	_oasis
	lib/libxenctrl_stubs.clib
	lib/xenctrl.mllib
	setup.ml