Setting the eip register still not available (deliberatelly).
I don't want to enable it util I find some easy interface to do it.
I don't want to allow setting of part of RIP register using 'set eip=<expr>' and leave the upper part unchanged ....
Remove unused test registres from debugger
Fix compilation error in cpu.h
Change trace-on/trace-off commands. Make one 'trace' command with usage of 'trace on/trace off'