* remote.c: Fix doc for `C' and `S' commands to indicate full

	* remote.c:  Fix doc for `C' and `S' commands to indicate full
	address.
	* (remote_ops extended_remote_ops remote_desc remote_write_size):
	Make static.
	* (remote_fetch_registers remote_write_bytes remote_read_bytes):
	Record size of response to fetch registers command, use this to
	limit size of memory read and write commands.
	* (push_remote_target):  New function to make it possible to have
	another target switch to the remote target.
	* target.h:  Add prototype for push_remote_target.
	* sh-tdep.c (sh_frame_find_saved_regs):  Fix sign extension bugs
	for hosts which default to unsigned chars (such as SGI's).
	* (_initialize_sh_tdep):  Don't set remote_write_size.  It's now
	handled automatically in remote.c.