* sparc-stub.c: Use a seperate stack for our traps.

	* sparc-stub.c:  Use a seperate stack for our traps.
	* Handle recursive traps.
	* Remove all trap init code.  This needs to be done by the
	environment.
	* (set_mem_fault_trap):  Call exceptionHandler() to setup this
	trap.
	* (handle_exception):  See if we are at breakinst, if so, then
	advance PC sp that users can just step out of breakpoint().
	* (case 'G'):  Don't let GDB hack CWP.  Also, copy saved regs to
	new place if SP has changed.
	* (case 's'):  Get rid of this, we can't do it yet.
	* (case 't'):  New command to test any old random feature.
	* (case 'r'):  New command to reset the system.
	* (breakpoint):  Add label to breakpoint trap instruction so that
	handle_exception() can detect where we are and get past the
	breakpoint trivially.