[Qemu-stable] Merging xen fixes and other fixes for 1.3.1

[Fabio Fantoni]

I see that is started merging for qemu 1.3.1, if is this the actual 1.3 
stable branch 
(https://github.com/mdroth/qemu/commits/stable-1.3-staging) probably is 
good add also other fixes.
My last test build was based on this:
http://xenbits.xen.org/gitweb/?p=qemu-upstream-unstable.git;a=summary
This repository have 1.3.0 including xen bug fixes, done some tests on 
wheezy, precise and windows 7 domUs without see regressions.
Probably is good includes also these or parts of these, for example:
xen_disk: fix memory leak
xen: fix trivial PCI passthrough MSI-X bug
Fix compile errors when enabling Xen debug logging.


I see there are also other spice and qxl fixes not included for now but 
probably is good includes also these or parts of these.
Some fixes probably good to check that I found not merged are:
qxl: Don't drop client capability bits
qxl: Fix SPICE_RING_PROD_ITEM(), SPICE_RING_CONS_ITEM() sanity check
For now I not tested them on 1.3 and I can't do good test for them 
because I use spice only on xen and qxl on it have some problems not 
solved for now.
I not know if are xen and/or qemu and/or spice bugs, I tested latest 
qemu from git including these fixes but problem with xen persists.
Also if these patches not solved my problems probably are good for solve 
problems of other qemu users.

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