Release Candidates Xen 3.4 RC3 & 4.0 RC5

New release candidates are available:
http://xenbits.xensource.com/xen-3.4-testing.hg (tag 3.4.3-rc3) http://xenbits.xensource.com/xen-unstable.hg (tag 4.0.0-rc5)

Please test! I think both of these are pretty close to final now.