No Xen development for 3.x any more

Hi, after thinking a lot about continuing xen as a hypervisor for ipfire 3.x (and after having talked to micha) I decided to not maintain Xen Hypervisor and Xen Userspace tools any more for now.

The reasons for this are: - I will switch from xen to kvm with my systems and so I will not spend a lot of time reading xen mailing lists - The Xen-Sourcecode is not really well "written" and documented - This leads to a big effort in looking for patches because of the hardened system - libvirt is not supported yet - and finally: I don't have the time to spend several evenings bug fixing after each new released xen version.

Ben