* remote.c (remote_open): Fix baud rate setting to make -b flag

* remote.c (remote_open):  Fix baud rate setting to make -b flag
work.  (remote_wait):  Change 'T' message parser to deal with new
improved format which allows stub to send an arbitrary bunch of
registers.
* sparc-stub.c:  General cleanups.  (trap_low, handle_exception):
make all this re-entrant by storing all state on the stack.  Clean
up memory error trapping.  (computeSignal, set_debug_traps):
make it all table driven.  Make a start at a baud rate setting command.