(sds_ops): Use it.
(sds_open): Don't set inferior_pid yet.
(sds_kill): Remove contents.
(sds_create_inferior): Rewrite to work more like monitor
interfaces.
(sds_restart): Remove, no longer used.
(tob64): Return the result length.
(sds_interrupt): Send a stop message.
(sds_wait): Add debug output for signal interpretation, flag
that signal was due to a trap.
(sds_fetch_registers): Fill the registers array correctly for
PowerPC.
(sds_store_registers): Get the right values from registers array.
(putmessage): Tweak length handling so checksum comes out right.
(sds_insert_breakpoint, sds_remove_breakpoint): Do correctly.
