* Makefile.in: Add dependencies for remote-fileio.o.

	* Makefile.in: Add dependencies for remote-fileio.o.
	* remote-fileio.c: New file implementing the remote File-I/O protocol.
	* remote-fileio.h: New header file defining remote File-I/O interface.
	* remote.c (remote_write_bytes, remote_read_bytes): Remove
	static storage class.
	(remote_wait, remote_async_wait): Call remote_fileio_request() on
	'F' packet.
	(_initialize_remote): Call initialize_remote_fileio().
	* remote.h: Declare remote_write_bytes() and remote_read_bytes().

	* Makefile.in (REMOTE_OBS): Add remote-fileio.o
	(SFILES): Add remote-fileio.c.
	Add dependencies for building remote-fileio.o.  Add remote-fileio.h to
	dependencies for building remote.o.
	* defs.h: Declare gdb_stdin, gdb_stdtargerr and gdb_stdtargin.
	* main.c: New ui_file gdb_stdin, gdb_stdtargerr and gdb_stdtargin.
	(captured_main): Initialize new ui_files.
	* ui-file.c: Add read and fgets input functions.
	(ui_file_new): set ui_file_fputs and ui_file_read to null functions.
	(null_file_read): New function.
	(ui_file_read): New function.
	(set_ui_file_read): New function.
	(stdio_file_read): New function.
	* ui-file.h: New type ui_file_read_ftype.
	(set_ui_file_read): Declare.
	(ui_file_read): Declare.