[CHANGESET] Documentation and behavior of read_readline_init_file are incoherent

[John W. Eaton]

On  3-May-2008, Rafael Laboissiere wrote:

| The documentation of read_readline_init_file says:
| 
|  -- Built-in Function:  read_readline_init_file (FILE)
|      Read the readline library initialization file FILE.  If FILE is
|      omitted, read the default initialization file (normally
|      `~/.inputrc').
|      
| However, when the following commands are issued:
| 
| octave:1> read_readline_init_file ("foo")
| octave:2> read_readline_init_file ()
| 
| the second one will not read the default initialization file.  Instead, it
| will reread "foo".
| 
| The very trivial changeset attached below seems to fix the problem.
| However, I think that the following code in liboctave/oct-rl-edit.c:
| 
|    else
|      rl_re_read_init_file (0, 0);

OK, I omitted this and the check on F (the rl_read_init_file function
can accept F == 0).

I also added a new re_read_readline_init_file function so we can
re-read the init file without having to know which one was actually
read the first time.

Thanks,

jwe