* breakpoint.c (ignore, condition): Add usage notes to help strings.

	* breakpoint.c (ignore, condition): Add usage notes to help strings.
	* symfile.c (add-symbol-file): Add usage note to help string.
	(add_shared_symbol_files_command): New command.

	gcc -Wall lint.
	* inferior.h (read_pc_pid): Declare.
	* breakpoint.c (watchpoint_check): Cache breakpoint in local
	variable b, remove unused variable other_type_used.
	* main.c (inferior.h, call-cmds.h): Include.
	(gdb_init): Declare.
	* remote.c (remote_wait): Return 0 by default.