This patch set adds a lot of new capability including support for
the leon2 and leon3. It also eliminates the difference between
the initial state of the simulated erc32 and the real hardware.
Fix the output from the simulator to gdb to use gdb interfaces
so the output is passes through the MI protocol if used.
Add a nouartrx option to the simulator so it does not block on
an stdin read. The termios settings put the tty into non-blocking
mode however the read sometimes blocks on high loads.
