Remove non i386/amd64 arches, rt featureset, patches, abi

This will be an x86-only kernel package, so remove non-x86 arches.

This is for i-pipe-based kernels, which don't match up with
RT_PREEMPT, so remove the rt featureset.

This should be close to vanilla in order for Xenomai dev support, so
remove distribution patches.

This will be updated, so remove 3.2.0-4 abi files.
Update to 3.5.7 kernel

- Update version in changelog
- Import patches from Debian 3.5.5 kernel [1] & fix to apply cleanly
- Import kernel configs from 3.5.5 [1]
  - Fix three kernel config options with invalid values [2]
- Remove unbuilt modules from 'installer' lists [3]
- Set ABI name to '1mk' for Machinekit
- .gitignore build artifacts

[1] http://anonscm.debian.org/viewvc/kernel/dists/trunk/linux/debian/?pathrev=19407
[2] output of 'make oldconfig':
    .config:989:warning: symbol value 'm' invalid for MFD_WM8400
    .config:1030:warning: symbol value 'm' invalid for BMP085
    .config:1526:warning: symbol value 'm' invalid for POWER_SUPPLY

[3] Error:
        kernel-wedge copy-modules 3.5.0-1mk amd64 3.5.0-1mk-amd64
    missing module olympic
    missing module hid-hyperv
    missing module serpent
    command exited with status 1
    make[2]: *** [install-udeb_amd64] Error 2
    make[2]: Leaving directory `/home/john/linux-rt-deb'
    make[1]: *** [binary-arch_amd64] Error 2
    make[1]: Leaving directory `/home/john/linux-rt-deb'
    make: *** [binary-arch] Error 2
WIP:  add Xenomai feature set

- README file
- Add 'xenomai' to config/*/defines
- Add xenomai kernel .config
- Add logic to install i-pipe patch at `debian/rules debian/control`
  - debian/rules includes any debian/rules.featureset-* files
  - rules.featureset-xenomai copies patch from linux-patch-xenomai pkg
    and puts into series-xenomai
WIP:  add featureset deps to packages; add Maintainer

Add Build-Depends: 'linux-patch-xenomai'

Simplify adding Depends: lines to e.g. Xenomai runtime packages that
need the Xenomai kernel feature set.  For example:

- Add 'linux-image-xenomai' to 'linux-image-3.5.0-1mk-xenomai-amd64'
  package
- Add 'linux-headers-xenomai' to
  'linux-headers-3.5.0-1mk-xenomai-amd64' package

Add me as Maintainer:
WIP:  README:  start cleaning up for release
WIP:  README:  add stuff from other repo