c/r rebase to 2.6.33-rc5

[Oren Laadan]

I rebased the most recent patchset to 2.6.33, and pushed to
ckpt-v19-rc2.10. only x86-32 is (lightly) tested.

it does not include patches from 1/27 and on. working on it
now.

please review:

* arch-specific parts that I didn't screw up anything.
btw, I moved checkpoint code from mm/ to kernel/

* [dan] network: net/checkpoint.c now uses sock_alloc_file();
there may or may not be a leak of sock_hold().

* [serge] selinux now auto-generates some include files, see
the changes to classmap.h

Oren.