[ES40-developers] Patch: Add breakpoint instruction

[Brian W. <bdw...@in...>]

I've been having trouble figuring out why openbsd just halts immediately
upon startup.  This adds the command "breakpoint instruction <hexval>"
which will force the emulation to stop when an instruction matching the
hexval has been run.  It also extends ctrl-c processing to the other
methods of starting execution (ie run xxxxx) and it dumps a little more
information when running dumpregs.

Brian