NAME: write_file

SYNTAX:
	int write_file(string file, string str)

DESCRIPTION:
	Append the string 'str' into the file 'file'. Valid write permissions are
	necessary of course.
	If you don't want to append to the file, then remove it first.

RETURN VALUE:
	returns 0 on failure, 1 on success

See also: efun/file_size, efun/cat, efun/log_file, efun/read_file, efun/save_object, efun/rm