PATCH: writing and reading CRx

[Jens Nerche]

Hi,
only a little patch: adding reading and writing from and to
control registers. Added CR4 (introduced with pentium).
There is no emulation at all, just r/w virtual CRx...
Today it's a cvs diff, hope that's ok.
Ramon, Ulrich: which indent options are used now? Perhaps
it's a good idea to add a "Coding Style" file?

jens

crx.diff